A multiple wavelength differential absorption laser radar has been constructed to measure the ozone profiles from the lower troposphere up to the upper stratosphere. The system consists of two subsystems ; one (the low altitude system ; LA) for the tropospheric measurements and the other (the high altitude system ; HA) for the stratospheric measurements. The LA system employs a KrF excimer laser with a deuterium and a hydrogen Raman shifter to generate 277, 292 and 313 nm laser pulses, and a receiving telescope with a diameter of 0.56 meter. The HA system has a XeCl laser with a deuterium Raman shifter and a XeF laser to generate 308, 339 and 351 nm laser pulses, and a receiving telescope with a diameter of 2 meters. The whole system is controlled by a mini-computer. Details of the system and some measurement examples are presented.