The basic structure of seat heater is as follows: the lower layer is a layer of non-woven fabric, and the heating wire is arranged on the non-woven fabric. The heating wire is fixed on the non-woven fabric with fixing tape, and the knitted cloth is covered on the fixing tape. The shape similar to the seat heating place is sewn with knitting thread, and it is stitched into the seat cover. In order to improve the comfort of passengers in the car, the seat heating temperature is controlled within a certain range, and two temperature controllers are arranged in the seat heating pad :(1) disconnect at 50±5℃, and connect at 30±5℃; (2) 43±5℃ disconnect, 23±5℃ connect. The backrest heater is connected to the power supply of the cushion heater through the plug connector, and the power supply of the cushion heater is connected to the dashboard harness through the plug connector, and then connected to the battery power supply through the seat heating switch, fuse wire and ignition switch.