Abstract: In this paper,based on encryption sounding data of years of continuous observation at the Jiulong station,through the comparison and analysis,to realize the site boundary layer atmosphere has the following characteristics: in the summer,the boundary air's temperature / humidity decreases with height,and not at the same time of temperature / humidity differences mainly concentrated in the lower atmosphere,the more close to the ground atmospheric temperature / humidity difference is more prominent. Never time performance at the same time,the temperature is lowest at 08: 00,the temperature is highest at 14: 00. The atmospheric humidity are smaller at 08: 00 and 14: 00,the air's humidity is bigger at 02: 00 and 20: 00.Potential temperature is increase with height,the biggest difference in the atmosphere below 3320 m. a temperature profile obvious adiabatic and super adiabatic phenomenon at 14: 00 and 20: 00,mixed boundary layer characteristics is obvious in atmospheric boundary layer at the two times,and atmospheric profile has stable boundary layer characteristics at 08: 00 and 02:00. The boundary layer has a maximum for wind speed,and the wind speed of the boundary layer is the largest at 20: 00.Surface physical quantity day by day evolution: temperature is minimum at 08: 00,the second at 02: 00,the highest temperature appears at 14: 00. 14 when,08,when the minimum average specific humidity is smaller at 14: 00 and 08: 00,and average specific humidity is bigger at 20: 00 and 02: 00. Minimum pressure appears at 20: 00,followed by 14,the highest pressure appears at 02: 00. the ground wind speed is Minimum at 02: 00,the biggest wind speed appears at 14: 00.