A novel method to obtain the velocity of dynamic object using the equipment with out velocity measurement factor is presented in this paper.A binocu lar stereo vision measurement system is used to measure the velocity of projectile.Firstly,we se lect the suitable parameters of two CCDs in order to obtain a clearer image of the measured movi ng object.Then based on the binocular vision system formed with the two CCDs selected,the 3-D coordinate data of the measured object are obtained.Secondly,the 3-D interpolation method is improved to interpolate the 3-D coordinate data of the measured model at dif ferent moments which are obtained by stereo matching.According to the 3-D data,the 3-D interpolation of the space position node is used to get the distance of the missle in the time period .And then the mean velocity is obtained.The experimental results show that using the equipment without velocity measurement factor,the method has higher precision ,and can meet the requirement for the dynamic parameter of moving objects in a long distance.