Taking a certain type of 300 L/min balance valve in the lifting mechanism system of truck crane as the research object,according to the structural characteristics and working principle of the balance valve,the mathematical model was established,and the flow area of the valve port model was accurately calculated.The simulation model in AMESim based on the mathematical model was built to analyze the static characteristics of load pressure,main valve flow,back pressure and control characteristic curve.At the same time,the balance valve was tested,and the test results were compared with the simulation results to correct the parameter values in the mathematical model.The results show that with the increase of the control pressure,the flow rate of the main valve port increases gradually;when the rated flow rate reaches to 300 L/min,the flow rate of the main valve port remains unchanged; the maximum error between the simulation curve and the test curve is 2.7%,which verifies the usability of the model.