A method for mechanics analysis of bar structure materials has been presented in the paper. The method is based on the theory of kinematics, dynamics, and programming techniques. After deriving of relevant equations, detail analysis about positions, velocities, accelerations, and angles, angular velocities, angular accelerations of bars as well as other parameters relevant to bar structure materials to be searched can be obtained in the paper. Relationships between various parameters and variables of bar structures have been derived according to different working states of bars. The method put forward in the paper is a feasible and high efficient method for mechanics analysis of bar structure materials in the design of mechanism.