Several imaging techniques for the imaging laser radar are outlined.The composition of laser imaging radar for air detection with linear array Avalanche Photodiode (APD) and scanning mirror is introduced.The design principle of laser transmitter,receiver and signal processing components of laser radar is shown.A prototype system is designed,which has an operating wavelength of 1.064μm,a vibration mirror of 1D,and a linear array APD of 32 pixels.The relation between the parameters is also considered adequately.