In the optoelectronic system, the image quality is affected by the vibration, especially the angle displacement. In order to reduce the influence of the vibration on image quality, an irrotational displacement isolator is designed based on spatial mechanism and vibration theory, which mainly consists of base platform, moving platform, spatial linkage mechanism and vibration isolators. The mathematical model is formulated by the way of vector and coordinate transformation in the linkage mechanism so as to derive kinematics modeling of irrotational displacement isolator. Based on kinematics modeling, two models aiming at irrotational displacement isolator are simulated and analyzed. The result shows that the framework effectively isolates the vibration, restrains angle displacement and plays important role in improving the image quality.