In order to achieve the deployable and segmented telescope’s coarse co-phase of the focus, this paper will take three segment mirrors to adjust the primary mirror surface. Firstly, a stepper motor and a linear motor implement to deploy the dynamic mirror within macro scale, i.e. μm magnitude. Secondly, piezoelectric actuator achieves the micro adjustment, i.e. nm magnitude. A three-degree of freedom platform made of three piezoelectric actuators can precisely adjust the segment mirrors’ tilt error and piston error. The test result shows that the flat mirror’s surface error is less than 0.5″by the three-degree of freedom platform adjustment. Testing the three segment mirrors optical system by the ZYGO interferometer, the result showed that it realized the confocal adjustment. This method for the segmented telescope’s coarse co-phase of the focus adjustment can be used for further surface error compensation to achieve fine co-phase of the focus.