A visible optical plasma diagnostic system is designed for EAST Tokamak facility. Due to the particularity of performance demand and working environment, an innovated optical structure was adopted, which satisfy the optical indexes, and minimize the radiation and stain at the same time. At last the wide-angle and high-speed visible plasma imaging system was designed, with 2.5 mm aperture diameter, 6 mm focal length, 60°×50°field of view, and 380 ~780 nm wavelength. Then the stray light was analyzed and the suppression method was implemented. After alignment, the optical performance was tested. The results show that all of the indexes satisfy the requirement of the system. Through the imaging experiment for the discharge process in the EAST Tokamak, the system was proved to achieving plasma imaging with wide-angle and high-speed.