Abstract: A chopper was used to change continuous laser into microsecond repetition-rate pulse width laser, then a single pulse chooser was used to make a single pulse laser from the repetition-rate laser. A trap detector was used to measure the output power of the continuous laser. Besides, the high-speed APD probe and high-gain PIN probe were used to detect the waveform of the pulse laser waveform, and the oscilloscope was used to measure the width of the pulse laser. Based on the measured power and waveform, the pulse laser-s energy could be obtained. Using this method, the 0.2 pJ micro energy laser measurement and calibration could be realized. Through analysis, the measurement uncertainty of the device reached 0.42%.