In order to improve the coordination of compound action of excavator working equipment,performance benchmarking tests were performed on working equipment compound action of three large excavators by arranging sensors in corresponding positions.According to the designed test and analysis methods, taking the time when the pilot pressure began to rise as the starting point,the movement time and time difference of the working equipment were calculated;based on the real-time collected data and the results processed by MATLAB software of the hydraulic systems in the compound action,the influence of each excavator hydraulic system design details on the composite action coordination of the working equipment was analyzed.The flow redistribution function was added in the hydraulic system of an excavator,and the composite action efficiency and coordination were compared before and after the improvement.The results show that adding an bucket arm speed control valve between the boom large cavity and bucket arm large cavity hydraulic systems,and adding a restrictor valve to the bucket large cavity hydraulic pipeline,the efficiency and coordination of the compound action of the working equipments can be significantly improved.