With the rapid development of the integrated circuit industry, higher requirements are put forward for integrated circuit testing, and the Precision Measurement Unit (PMU) is the core unit for integrated circuit DC parameter testing. A PMU circuit for integrated circuit testing is designed in this paper, which uses a Field-Programmable Gate Array (FPGA) to control the DAC module to apply voltage excitation. The excitation signal after the PI regulator and power amplification is applied to the Device Under Test (DUT) through the resistor matching network, Then, the ADC module reads back the test response data to realize the parameter testing functions such as applying voltage to measure current and applying current to measure voltage. The designed PMU circuit has the advantages of wide test range and high measurement accuracy, with an applied or measured voltage range of -10V to +15V and a maximum current of ±1.838A. The system performance in different test modes was calibrated and functionally verified with high-precision resistive loads, and the experimental results show that the system calibrated test error is better than 0.05%, which is able to meet the requirements of DC parameter testing of general-purpose integrated circuits.