In order to quantify the judgment, it is necessary to quantitatively describe the relative superiority of any two schemes to a criterion. In general, for a single criterion, the comparison of two schemes, can always judge the pros and cons. The AHP method adopts 1 - 9 scale to give comparison scale to different comparison, just like in Table 1. (2, 4, 6, 8 is the compromise scale between the upper and lower scales, and can be omitted) (Luo, Zhang, & Zhang, 2020).

Index of matrix consistency judgment C.I. (Consistency Index)

C . I . = λ max − n n − 1

The ratio of C.I. to average random consistency index R.I. is called the random consistency ratio C.R. (Consistency Ratio).

C . R . = C .I . R .I .

Through questionnaire survey and field interview, teachers and students of Sichuan University of Arts and Science attach importance to various indicators of Cainiao Courier Station’s user satisfaction. Through repeated investigation and research, the judgment matrix of the hierarchy of influencing factors of Cainiao Courier Station’s user satisfaction of Sichuan University of Arts and Science is determined as shown in Tables 3-7. In addition, the correlation matrix was tested for consistency according to the analytic hierarchy process (AHP), and the results showed that all the five judgment matrices met the requirements of C.I. < 0.1 and C.R. < 0.1, indicating that all the five judgment matrices passed the consistency test. After relevant calculation, the weights of relevant indicators are obtained, as shown in Table 2. It can be seen that teachers and students of Sichuan University of Arts and Sciences pay more attention to the speed factor of the way of picking up packages, which also conforms to the demand orientation of teachers and students of universities for the Cainiao Courier Station.

According to the principle of random sampling, this questionnaire was sent to all teachers and students of Sichuan University of Arts and Science in December 2019. A total of 405 questionnaires were issued and 400 valid questionnaires were recovered, with an effective rate of 89%. Male students accounted for 35.5% (142) and female students for 64.5% (258), which is consistent with the fact that female students prefer shopping. Among the surveyed personnel, 28% (112 people) often go to Cainiao Courier Station (more than 8 times per month); Sometimes, those who go to Cainiao Courier Station (5 - 8 times per month) account for 39% (156 people), while those who seldom go to people (0 - 4 times per month) account for 33% (132 people), indicating that teachers and students of Sichuan University of Arts and Science have certain consumption ability. The survey data basically conforms to the shopping characteristics of teachers and students in colleges and universities today.

According to the questionnaire data, the user satisfaction of Cainiao Courier Station of Sichuan University of Arts and Science was evaluated by fuzzy comprehensive evaluation method. The evaluation level is set as 5, that is, V = {V1, V2, V3, V4, V5}, and the score of 1 - 2 is V1, indicating very dissatisfied; a score of 3 - 4 is V2, indicating dissatisfaction; a score of 5 - 6 is V3, indicating general satisfaction; a score of 7 - 8 is V4, indicating satisfaction; a score of 9 - 10 is V5, which means very satisfied. The evaluation grade of each index is shown in Table 7. The secondary matrix is constructed according to the above data, which is represented by R1, R2, R3 and R4 respectively.

The weight set of each index determined by AHP in Table 2 is as follows:

The weight of the first indicator

W = [0.454, 0.071, 0.197, 0.278]

Each index weight value of in-and-out-of-storage management factor

W1 = [0.635, 0.365]

Each index weight value of customer service factor

W2 = [0.510, 0.286, 0.204]

The weight value of all indexes of the geographical location factor is

W3 = [0.151, 0.539, 0.310]

The weight value of all indicators of facility and equipment factors is

W4 = [0.392, 0.608]

According to B = W ∙ R, the evaluation vectors of the secondary indexes can be calculated as:

B1 = W1 * R1 = [0.045 0.045 0.335 0.512 0.062]

B2 = W2 * R2 = [0.065 0.016 0.354 0.479 0.087]

B3 = W3 * R3 = [0.048 0.050 0.427 0.342 0.132]

B4 = W4 * R4 = [0.052 0.073 0.423 0.371 0.081]

According to the above calculation results, a first-order matrix was established, and the evaluation vector B = W·R = [0.049 0.052 0.379 0.437 0.083] was calculated and showed that in the overall evaluation of user satisfaction of Cainiao Courier Station of Sichuan University of Arts and Science, 4.9% of students feel very dissatisfied, 5.2% feel less satisfied, 37.9% feel generally satisfied, 43.7% feel satisfied, and 8.3% feel very satisfied. In general, Sichuan University of Arts and Science has a high user satisfaction to Cainiao Courier Station, but the proportion of general satisfaction is not small, indicating that there is still a large room for improvement.

From the satisfaction evaluation of teachers and students of Sichuan University of Arts and Sciences on index layer factors, as shown in Table 8, the main problems are the floor space and the arrangement of goods in Cainiao Courier Station, and according to the teachers and students of the surveyed school, the Cainiao Courier Station covers a relatively small area and the arrangement of goods is chaotic, which makes it difficult and crowded for teachers and students to find the goods and thus inefficient (Wang & Chen, 2018). At the same time, the environment of Courier station stores is not good. In order to save the express cost, the express company uses non-biodegradable plastic bags, which gives off a pungent smell. Although there is a packaging and recycling area in Cainiao Courier Station, some teachers and students do not put the express package into the recycling box of Cainiao Post after taking the package, and throw it into the surrounding or garbage can. If they do not deal with the package in time and encounter strong wind, the phenomenon of packaging bags and waste paper shells flying randomly will appear, which will affect the overall appearance of the school. In addition, due to the low speed of the outgoing equipment, there are often long queues at the peak of the outgoing time and the waiting time is too long. At the same time, it also affects the rate of finding packages for teachers and students, resulting in the greatly reduced efficiency of picking up pieces.

Although Cainiao Courier Station of Sichuan University of Arts and Sciences covers an area of 265 square meters, due to the large number of teachers and students in the university, the daily storage quantity can reach high to 11,274 pieces and the outbound quantity 106,749 pieces, which requires that Cainiao Courier Station should have enough area to store enough shelves and accommodate large quantities of express delivery. In addition, the number and area of channels also need to be expanded to improve the efficiency of teachers and students in finding items independently, and to avoid stampeding or falling delivery injuries caused by crowding. By increasing the area of use, the capacity of Cainiao Courier Station can also be improved, so as to provide better, more comprehensive and more efficient services for more users who need Cainiao Courier Station of Sichuan University of Arts and Sciences.

The main service objects of Cainiao Post station of Sichuan University of Arts and Sciences are teachers and students. Affected by the unified schedule, the time for picking up samples is relatively unified, which is likely to cause congestion during the picking up process. Service efficiency has become one of the important factors affecting the satisfaction of teachers and students (Yin, Bao, Chen, Yu, Li, & Wang, 2020). The concrete improvement measures to improve the service efficiency of Cainiao Courier Station are as follows. Improve the efficiency of express delivery warehousing, reasonably plan the warehousing route, and scientifically arrange the warehousing time of each express company, and transport the express delivery to Cainiao Courier Station within the specified time for warehousing operation, so as to avoid the situation that the express delivery on the same day arrives at Cainiao Courier Station the next day (Chen, Liao, Yin, & Zhong, 2019). At the same time improve the efficiency of express delivery in and out. First, it is necessary to rationally plan the layout of shelf arrangement in Cainiao Courier Station. The shelves should be arranged in sequence of Numbers. Meanwhile, express delivery should be placed according to the classification number of package size and weight, so as to reduce the time for students to find express delivery and improve the efficiency of express delivery in and out (Wang & Feng, 2019). The second is to simplify the process of express delivery and warehousing and the receiving steps. By taking advantage of the universality of the network, teachers and students can receive the delivery push message by downloading The Cainiao Wrapping APP, and complete the authentication in advance. Teachers and students can place an order through the Cainiao Wrapping APP in advance, and directly give the express mail to the staff to pack when they arrive at the Cainiao Post station (Zou & Yin, 2019).

Create a public account of Cainiao Courier Station of Sichuan University of Arts and Science on WeChat platform. Through WeChat public account platform, teachers and students can evaluate the service of Cainiao Courier Station, inquire express information, give feedback and suggestions, and make complaints, so as to vent their dissatisfaction. Teachers, students and the staff of Cainiao Courier Station gradually formed two-way interaction, and the emotions of teachers and students were vented and calmed down, and their satisfaction would be gradually improved (Du, 2017).

According to the case of missing express item, the most important problem to be solved is the specification of the operation process of express delivery in and out of the warehouse, so as to avoid the occurrence of less and missed deliveries. At the same time, it is also necessary to strictly verify the information of the pickers, strengthen the accuracy of camera surveillance at Cainiao Courier Station, and avoid the occurrence of wrong packages or stolen packages. If a person is found stealing packages, report the theft to the college or university and discuss with the school to deal with the case. In terms of the intact degree of express delivery, if the express delivery is found damaged, if the damage degree is relatively minor, the packaging should be reinforced in time, and if the damage is serious, the consignee should be immediately notified to come to check and confirm the express delivery, and negotiate with the user on the treatment measures.

First, Cainiao Courier Station can raise money from various Courier companies to promote and use biodegradable bags. Second, a green campus express day can be set from the school level, with the theme activity of a “create green logistics, start from you and me”, to publicize and promote the use of biodegradable packaging through public platforms such as campus WeChat official account, QQ space and WeChat group, so as to raise the awareness of green environmental protection among teachers and students of the school as well as the express delivery industry. Thirdly, the number of recycling bins can be increased to avoid overflowing. We can also sort and recycle other packaging, and cooperate with the paper shell factory near the school to send the paper shell that cannot be directly used to the paper factory for secondary recycling and processing, which can not only make a second use of express package, but also reduce the cost of packaging materials, reduce the pollution of campus environment, save natural resources, and deeply practice the concept of “green logistics” (Wang, Zhao, & Zhang, 2020).