The work aims to improve the design of nucleic acid detection kit to avoid secondary pollution caused by improper treatment of infectious source in the use and recovery cycle of nucleic acid detection kit, so as to build a good ethical care relationship under the background of normalization of epidemic situation. Firstly, the disadvantages of current nucleic acid detection products were analyzed, the functional requirements were obtained, the design type was determined and the functional requirements were decomposed with AD theory. Then, the preliminary design scheme was coupled and judged, and TRIZ was used for decoupling to obtain the design scheme finally. The design method integrating AD and TRIZ was used to design the safety disinfection module of the nucleic acid detection kit from the perspective of ethical care, and the nucleic acid detection kit was improved to an integrated structure and added with disinfection and sterilization module. The final design scheme could effectively solve the secondary pollution and achieve ethical care. By the design method integrating AD and TRIZ, the scheme improves the design of nucleic acid detection kit from the functional structure, and solves many problems in existing products. In addition, the scheme pays attention to the product use experience in the design, helps people ease the tension and build trust when using the product, and provides ideas and references for the innovative design of new functional modules of the product.