The utility model provides an electric tracing area, wherein, inside pipe is gone up to wrap up there is the electric tracing heat preservation that accompany section heater between tropical formula tide, an inside pipe, suit are managed, are twined at inside outside of tubes face the outside of inside outside of tubes face to it is fixed to adopt waterproof material to seal, a flange is installed respectively with inside pipe both ends to outside pipe, and this flange is used for being connected with the submerged motor pump unit, and the electric tracing area is through outside pipe to after carrying out seal welded with waterproof material, directly cause in the ground power supply junction box. The utility model discloses not only can be waterproof, dampproofing, prolonged the life of section heater between the tide, it is sealed not tight to have solved the resistance -type heater, inside weing easily and the unable problem of using, and it makes simply, greatly reduced cost of maintenance and maintenance work volume, improved work efficiency.