Aim\ The measuring instrument of burning speed of propellant is studied. Methods The burning speed of propellant is measured with an 8031 singlechip computer in 8 channels. The problem of antiinterference of the instrument in adverse circumstances is solved by designing hardware circuit and corresponding software. Results\ The new design increases system ability of antiinterference

and enhances the measuring precision of burning speed of propellant. Conclusions\ The adopted scheme is proved feasible.