The direct objective of the project is to identify the specific reasons for the high complaint rate. The upgrading and transformation of products, that is, the upgrading and transformation of infusion bags, seems to be the right direction. The questionnaire survey told us that 90% of the adverse feedback occurred on the infusion bag. The main defects of the infusion bag are the leakage of the infusion bag, the unclear printing of the words on the infusion bag and the redundant leftovers on the infusion bag. The product upgrade can be completed by solving the above problems. I believe that the complaint rate in the market will also decline.