The xenon flash lamp produces transient high-power white light,as wel l as provides a high-intensity UV emission spectrum,with outstanding features s uch as small size.Measuring the instantaneous light pulse emission spectrum, especially the single pulse emission energy,not only can be used to analyze the energy conversion efficiency of the light sourc e,but also can be used to investigate the stability of the flash lamp.This pap er analyzes the working principle of a short-arc pulse lamp and the relationshi p b etween the radiation energy and the input energy.The method of pyroelectric ener gy detection probe is used to establish the light pulse energy measure ment system.The experimental results show that when the main input voltage is 900V,the single light pulse energy is 162μJ and the stability is less than 2%.