During the spring festival, the distribution transformer load has obvious fluctuation characteristics due to the population flow. In the short term, the distribution transformer will be overloaded due to the load growth. The power supply bureau usually uses the method of emergency replacement of distribution transformer before the Spring Festival. Combined with the load forecasting model, this paper establishes a set of distribution transformer switching strategy algorithm to adapt to the Spring Festival period. Through the data analysis of material inventory distribution and distribution transformer in operation, the optimal switching strategy is obtained, which makes the distribution transformer safe operation and distribution transformer utilization rate achieve optimization. It can solve the problems of manual calculation data deviation, lack of reliable algorithm to formulate the exchange scheme, the implementation effect is not obvious, and can not realize the optimal allocation of resources. Through the actual example, the algorithm can optimize the goal of switching distribution transformer during the Spring Festival, improve the effective utilization of resources, and solve the risk of overload operation of distribution transformer.