According to the practical situation of Jiangxi Grid， two kinds of movable DC de-icer design which are respectively suitable for 500 kV and 220 kV or under transmission line are presented. The former may work as DC de-icer or as HVDC transmission，etc. Its main equipment is built based on the voltage source converter（VSC） with insulated gate bipolar transistor（IGBT）， which realizes removability with semi-mounted platform trailer by modular design. The main circuit structure of the latter one is used three phase controlled thyristor bridges to meet practical requirement. The removability of whole system is implemented with container suspension. Combined with testing experience on site， an integrated commissioning method of DC de-icer and some key remarkable items are put forward. It may be an useful reference for testing similar equipments.