Considering the problem of high precision attitude measurement for high speed rotating ammunition, a semi-strapdown inertial measurement system solution was proposed and projectile's initial parameter binding before launch and the navigation information transfer method in the case of existing relative rotation during flight for semi-strapdown platform were discussed, then the multistage bluetooth wirelessdata transmission solution was designed and introduced. On this basis, ground turntable simulation test was carried out, and then multistage bluetooth data communication test was finished. The experiment results show that the bluetooth solution for data transmission is convenient and reliable, which is helpful for miniaturization of semi-strapdown platform. At the same time, the calculating error of attitude angle of carrier is less than 0.4°, which meets the requirement for accuracy test of high-speed rotating ammunition.