The QE65000spectrometer is applied to remote-sensing differential opt ical absorption spectroscopy (DOAS) system for its ultraviolet high sensitivity,low n oise,small size,light weight and other characteristics.Firstly,offset current,da rk current and correlation between dark current and integration time of QE65000detector are studied in thi s paper.Then band range and resolution of the spectrometer are calibrated by using Hg lamp.Th e DOAS system based on QE65000is developed and used to measure absorption spectra of atmospheric tr ace gases and absorption spectrum of xenon lamp.According to differential principle,atmo spheric trace-gas concentrations are retrieved in this paper.The errors and detection limits of re m ote-sensing system are also given.Research results show that the miniaturized and po rtable DOAS system can be realized by applying QE65000spectrometer.