For the high-speed data transmission requirements of remote sensing micro-nano satellites to the earth, the system technology of data transmission with laser for micro-nano satellites has been studied. The key technologies such as the high-precision cooperating PAT between micro-nano satellites and laser communication terminals, the light and small space-based terminals, composite photoelectric construction and so on, have been studied. The development of space-based laser communication terminal and ground laser communication terminal for the micro-nano satellite have been completed, and the demonstration experiment of laser communication between micro-nano satellite and ground laser communication terminal also has been completed. The 1 230 km satellite ground data transmission with 10/50/100 Mbps satellite ground data transmission has been realized, and the relevant technologies have been verified, which provides an ideal satellite ground data transmission means for the follow-up micro nano satellite remote sensing to the earth in China.