The effect of DC and even harmonics test is an important part of electricity meter test. The traditional detection method has low efficiency, and poor stability. After analyse the reason of harmonics' generation and the damage to electric energy metering. Interpreted the test process and connection method of standard, put forward a new method to DC and even harmonics automatic load matching, then design a test equipment according to the new method. At last, test the device, confirm the device could produce waveform that standard required, realize the automatic load matching, reduce manual work, improve the detection efficiency and stability.