The nine-plunger dual axial plunger pump for excavators was used as a model, the hydraulic system of the pump was simulated and analyzed by using the AMESim hydraulic simulation platform to obtain the variable characteristics of hydraulic pump pressure, flow rate and efficiency. According to the characteristics of the dual pump system, a simulation model of the dual pump hydraulic system was built to analyze the characteristics of the above variables under different load signals. The experiment verification was carried out through the experimental platform built, and the test results were analyzed. Combined with the simulation results, a more complete simulation analysis of the hydraulic system was made, which provided reference for further research on the pump.