In order to check the sensitivity of SF6 gas leakage imager, refer to the test method of helium mass spectrometry detector, develop a set of different leakage rates of pressure leak and a gas supply system for the pressure leak. At the same time trial-produce a leak calibration system for calibrating the leakage rate of standard leak, and study the influencing factors (temperature, pressure) on the leakage rate of leak. Finally conduct a preliminary verification on the SF6 leakage imager(FLIR).