To prevent frost crack pipe method: constant temperature using with tropical, when the pipeline temperature is below a certain value (for example 2 DEG C), to close to the wall of the pipe with tropical electricity heating; when the temperature of the pipe reaches another value (for example 6 DEG C), with tropical power-off. With tropical power calculation method: wide 8mm, 15 watts per meter, 20 watts, 10 meters up to 200 watts, 0.5 square wire can be used, if the width is greater than 8mm, each meter of power is greater than 20 watts. With the longer the tropical power, the constant temperature control circulation pump, so that the pipeline water and water tank of heat exchange, improve the temperature of the pipeline to prevent icing. If the full automatic control cabinet design is reasonable, the heat exchanger and the water tank for the heat exchange of the circulation pump can serve as antifreeze circulating pump.