Conventional fixed substation has such disadvantages as complex approval procedure, numerous structures and long construction period, therefore it cannot meet the requirement of rapid power supply. As a result, vehiclemounted mobile substation is used. The application of the vehiclemounted mobile substation in the construction of JilinTumenHunchun passengerdedicated railway is monitored and analyzed. The main study contents and conclusions drawn are as follows: 1) The application of the vehiclemounted mobile substation in the construction of JinlinTumenHunchun passengerdedicated railway is studied, which shows that the vehiclemounted mobile substation adopted can meet the requirement of the power supply; 2) Comparison and contrast is made between the vehiclemounted mobile substation and the conventional fixed substation, which shows that the vehiclemounted mobile substation is superior to the conventional fixed substation; 3) The successful application of the vehiclemounted mobile substation in the construction of JilinTumenHunchun passengerdedicated railway shows that the vehiclemounted mobile substation technology is a kind of new technology that can meet the requirement of rapid construction, which can provide reference for the construction power supply of similar projects in the future.