In the dynamic-gyro laser seeker，dynamic characteristics of drive device and dynamic-gyro have an influence on the moving accuracy of the seeker.Based on the configuration and principle of the seeker,dynamics model,with the azimuth/pitching frame angle and angular velocity of optical axis as state variable,is built and simulated by means of kinematics theory of optoelectrical stabilization and coordinate transform.Analysis and simulation results conform to the actual movement rule of optical axis.That provides model support for designing the seeker controller and is also helpful to analyze the hardware-in-the-loop simulation results.