1, don't go swimming alone, let alone in places where you don't know the bottom and water conditions, or dangerous places where drowning casualties are likely to occur.

It is not advisable to swim in too cold water. If you feel that there is a big difference between the water temperature and the body temperature, you should slowly enter the water, gradually adapt to it, minimize the number of times, and reduce the stimulation of cold water to the body.

Pay attention to your health. People who are prone to cramps in limbs should not take part in swimming or swim in deep water. Get ready before you go into the water and exercise first. If the water temperature is too low, wash your body with shallow water first, and then go swimming after getting used to the water temperature. Students with dentures should take them off to prevent them from falling into the esophagus or trachea when choking.

4. Swimming should be carried out in the swimming area with safety protection zone, and swimming in the non-swimming area is strictly prohibited. Children in rural areas should choose areas that are familiar with underwater conditions.

It is very dangerous to swim in the open air and encounter heavy rain, so you should go ashore immediately and go to a safe place to avoid the wind and rain.