A method for an operation management APP comprises the steps that: when work assigners need to arrange operators to perform detection of device of a power grid, a second spreadsheet is opened on a background server, wherein input of a work order state is 0; the background server is arranged in a server cabinet which is a cuboid structure, the top wall of the server cabinet is provided with a liquid storage cabinet containing refrigerant fluid, the bottom wall of the liquid storage cabinet containing refrigerant fluid communicates with two ends of a cavity with two communicating ends, and the cavity with the two communicating ends is arranged at the surface of the side portion in the server cabinet. The defects are effectively avoided that time and energy is wasted, operation is tedious, refrigeration performances are not good to damage performances of the background server and workers' bodies are damaged by microwave.