1. Pay attention to the sanitation of drinking water as much as possible, do not drink unsanitary standard water, and clean and disinfect before drinking. There are many ways to clarify by mixing water, such as alum, aluminum sulfate, ferrate or polyaluminium chloride. If there is no alum and other coagulant, you can use local materials, such as cacti, cacti, Mufu group, horsetooth garden, elm leaves or kapok, etc. to pound them into mixed water, which can also accelerate the floating speed and improve the sedimentation effect. In addition, it can also be used to purify water. After the earthquake, we try to find enough water banks, and de with good water quality is in the aspect of water source protection. The selected water source shall be protected and no source of pollution, such as faeces, rubbish or corpses, shall be found within 50 meters.