Micro pulse lidar(MPL) is an ideal tool for large-scale monitoring atmospheric aerosol profile and cloud. MPL's characteristics are introduced and the technology for both of the coaxial and non-coaxial MPL are discussed. Some examples of application are also shown using the MPL-A1 and MPL-T developed by our lab to measure the extinction coefficient profile, the boundary layer, the heihgt of cloud, and the visibility.