Abstract: The method and its engineering realization of measuring long distance projectile rotating speed by means of radio fuse trajectory monitoring principle are developed. High sensitivity receiver measurement system consists of HP8566B spectrum analyzer and preselector. The transmitting equipment is made up of ring shaped antenna radio fuse. It has been proved by practical use that the measurement system is stable and reliable. The advantage of the method is as follows: new equipment in shell is not necessary to be developed, and the projectile itself need not be modified.