The Lband GFE(L) 1 radar radiosonde can provide dense data in vertical, and the measurements are available from the ground to high altitude. The characteristics of the Lband radar in gathering data can be used in analyzing the characteristics of Atmosphere Boundary Layer (ABL) in the main urban area of Chongqing. The temperature inversion, visibility, thick fog and air pollutant indexes are analyzed by means of the radiosonde data. The results indicate that the Lband radar radiosonde data can be applied not only in the analysis of the characteristics of ABL but also in meteorological service fields such as air pollution forecasting, fog forecasting, emergent meteorological service (such as the leakiness of harmful gases), evaluation of wind energy resources, etc.