Abstract: The paper introduces an intelligent test system for power and fuel consumption test of small tractors. The system was developed by use of the microelectronics and single chip computer interface technique, based on single chip computer AT89C51 and inspecting the shape of signal wave by technique on dynamic display of data, which came from HBR-1 type pressure sensor and HY-1 type flow sensor. The measurement accuracy of power is ±0.10%(kW). It can measure power and fuel consumption of small tractors continuously, rapidly and accurately.