In order to achieve high-precision,controllable rotation of uniaxial crystal particles,the optical rotation can be achieved by the interaction between the beam of light and birefringent crystal particles.Based on the theory of wave optics,the main factors influencing the rotating angular velocity of uniaxial crystal particles were considered,(such as the thickness and radius of the particle,the angle between optical axis and crystal plane,the reflection of light beam on the crystal plane,the phase contrast between the ordinary and extraordinary rays,and the laser power.) The general formula of rotating angular velocity of positive and negative crystal were derived,moreover,the optical rotation of calcium carbonate particles and silica particles which represent the positive and negative crystals chosen as experimental material were simulated and calculated,and the rationality of the proposed theoretical model was testified by comparing with previously experimental data.According to the test results and theoretical analysis,calcium carbonate particles chosen as mechanical rotor was more appopriate,meanwhile,the radius and thickness of crystal particles should be chosen from 1~3 μm,further moer,the conclusions show that the parameters of mechanical rotor were optimized design to improve the rotation frequnency of the rotor.The results had directive significance to optical driven micro-mechanical motor design and the material selection of rotor.