Abstract: The specifications of inertial navigation system (INS) such as volume and operation speed are dependent on hardware circuit, and an optimal hardware implementation of INS can enhance the system precision. According to the volume and operation speed demands of a micro INS, an INS for a specific engineering application is presented. The field programmable gate array (FPGA) is used as the core of sampling and controlling inertial sensor, a parallel sampling plan is designed, and the inertial calculation is implemented by using a 32-bit floating-point digital signal processor (DSP). The results obtained from rotation table and field tests show that this system has strong anti-interference ability, rapid response, convenient calibration for initial unit and easy implementation.