1. With the development of economy, all localities should speed up the construction of urban sewage treatment projects, gradually replace septic tanks as soon as possible, improve the treatment degree of domestic sewage, ensure the sewage treatment effect, protect the environment, reduce water pollution, and solve the environmental sanitation problem of septic tanks. 2. The traditional septic tank can be converted into a biogas purification tank. This lesson is entitled Central Patriotic Health Association Promotion Project. The "Ecological Public Toilet" in Jinhua, Zhejiang Province, which won the national patent and the "Edison Cup Award" in China, is a successful example. The biogas purification pool is located under the public toilet, and the fecal sewage is treated by the biogas purification pool, eliminating the septic tank. The generated biogas is used as the living fuel for the toilet managers, and the waste liquid is used as the organic fertilizer for greening the roof, wall surface and surrounding environment of the toilet and growing vegetables. It has the advantages of good fecal treatment effect, comprehensive utilization of waste materials, convenient use, beautiful environment, economic benefits, environmental benefits and social benefits. 3. It is a promising development direction to transform the traditional septic tank into a five-cell anaerobic digester, which has been studied in China in recent years. At present, small anaerobic or aerobic sewage purification tanks are widely used abroad, which is also worth studying. 4. Septic tanks will exist for a long time as a transitional form, so it is necessary to strengthen the management of septic tanks and strictly implement the system of regular cleaning. According to the investigation of three residential quarters in Taiyuan, 81% of the septic tanks have not been cleared for more than two years, and some have never been cleared since they were put into use. 5. In the management of septic tanks, it is mandatory to disinfect with bleaching powder regularly to enhance the treatment effect and improve the bacteriological index of effluent, but the normal fermentation should not be affected by too frequent use of bleaching powder. 6. The process parameters of traditional septic tanks depend on the suitable range, the adaptability of sewage quantity and water quality, and should be further studied and improved. At the same time, the research and development of efficient sedimentation technology should be carried out to improve the treatment effect and volume utilization rate of septic tanks.