An embedded-Linux software platform of flight control system is exploited for the developing requirements of flight control system on micro air vehicle. The platform consists of embedded development environment on the host computer and airborne embedded bottom software. The building process of the embedded development environment on the host computer is introduced at first;then software platform is built,which includes making boot-loader,compiling the kernel,making root file system,and designing peripheral device drivers. The performance of software platform is verified through testing the device drivers of sensors with different kinds of interface,which indicates that the designed platform is general,easy to be maintained,easy to expand functions and it can satisfy the requirements for the design and test of upper flight control software on micro air vehicle.