A Rayleigh-Raman-Mie Lidar (RRML) has been developed for measuring atmospheric temperature,density and aerosol profiles. As a combined system,RRML has the ability to measure aerosol and cirrus up to 25 km at night and 5 km during daytime. Especially,lidar is the most efficient method in measuring stratospheric aerosol. Using RRML system,the change of tropospheric temperature,the inversion layer at stratosphere and the background aerosol at stratosphere has been detected in Hefei,China. The results indicate that measurements of RRML are reliable,and RRML can be employed for the routine observations and the analysis of atmospheric temperature and aerosol.