Abstract: In order to resolve the deficiency in power match of loader engine and torque converter at present, a hydraulic test system of loader was built in the paper, and a quantitative relationship between the sensor pressure signal and torque was defined. Under the typical operating condition that shoveling was working condition, the sampling frequency was 1 000 Hz and sampling length was 60 operation cycles, an actual loader test was made. Test data were proposed by a series of procedures, including segmentation, mergence, filtration, elimination of abnormal value, stationary test with the software of Vib’SYS and nSoft, and then preparation method of load time course of hydraulic system at loader typical operating conditions was studied. It was concluded that a load time course of single typical cycle time for hydraulic system consuming engine torque was 87.304 s when loader shoveled soil in situ. This study provides a basis for loader optimal design.