In order to make the measurement of the p-V curve and the overall process of calculating theefliciency of the heat engine from the curve an easy to operate part of university physics experiments , the autholfirst built the PASCO 'Tracker experimental system,Then , under two high temperature heat source temperaturesthe measurement of the p-t and V-t relationship curves in the operation of the heat engine was praeticed usingthis system , and based on this, the p-Y curve was obtained. After fitting the p-V relationship function , Therelationship between the efficieney of the thermal engine and the temperature of the high-temperature healsource ,as well as the mass of the steel wire loaded into the cylinder, was obtained through the caleulation of theprineiple formula.'The measurement results indicate that the period of pressure and volume both deerease withthe inerease of steel wire mass , while the ellicieney inereases with the inerease of steel wire mass.The two havea non-linear relationship.The elficieney of the thermal engine inereases with the inerease of the temperature ofthe high-temperature heat source.This experimental system can be used to demonstrate real-time monitoring olhe working process of a heat engine and to measure and calculate the eliciency of the heat engine.