The performance of attitude measurement system has a direct impact on the guidance and control accurate of high-spin projectile. Attitude hardware-in-the-loop simulation (HILS) experiment is an important means to verify, evaluate and optimize the performance of attitude measurement system of high spinning projectile. The traditional attitude HILS system transmits the command contained angular rate to the three-axis turntable through a simulation computer with low timing accuracy directly. There is a problem that the transmission rate of command does not match the sampling frequency of the inertial measurement component, and this mismatch will seriously affect the simulation effect of the attitude in a high-spin environment. In order to solve the problem, the instruction transmission method is improved. Firstly, a high-speed data transmission board based on the STM32 ARM core is designed to improve the transmission rate of command. Secondly, the finite impulse response filter (FIR) is used to suppress the noise of the data send from the turntable for improving the accuracy of data and reducing the simulation error of attitude. The results show that the attitude error is less than 0.1°. The HILS system is simple to implement, low cost, high simulation accuracy, and has practical application value.