DC de-icer technology is an important technology to defense ice disaster in power grids. In the process of the existing DC de-icer performance tests

open-circuit voltage or short-circuit current alone is taken as detection object

which can not simulate the real ice-melting conditions totally. To design simulation load used in DC de-icer test with full voltage and high current

a 10 MW DC de-icer was taken as an example. Based on the computational fluid dynamics（CFD） and the heat transfer theory

a 1/100 scaled power simulation load was designed

using water as conductive and cooling medium for the simulation load. Then

the fluid field distribution and temperature rise of scaled model were calculated by using the finite element method

and the confirmatory physical tests were conducted to measure the temperature rise of load device. At last

according to the actual power requirements of a DC de-icer

the electrical structure and heat dissipation of full-voltage and high-current load device were designed. The results show that the temperature rise of electrodes can meet the design requirements of 70 ℃

where the inlet flow rate of simulation load reaches 17 m3/h. The feasibility of equivalent simulation load in DC de-icer test using water medium is verified.