To meet the demand of high-precision directional and detailed detection in a wide coastal zone, the new generation of ocean color observation satellites, the Coastal Zone Imager, employs the imaging technology featuring a front-mounted wide-range pointing mechanism. It utilizes a drive system consisting of "stepper motor rotation + harmonic gear reducer transmission" and a telemetry system incorporating "Hall effect digital switch circuit + absolute photoelectric encoder". Through successive approximation closed-loop control, it achieves a detection range of 1,000 km with an accuracy better than half a step angle, enabling accurate on-orbit line-of-sight positioning and precise surveying of hotspot areas. In ground laboratory tests, the Coastal Zone Imager achieved a control accuracy of better than 20 arcseconds and a measurement accuracy of better than 10 arcseconds for the line-of-sight pointing angle. The on-orbit tests fully verified the feasibility and robustness of this line-of-sight pointing system. This design is characterized by high positioning accuracy, high reliability, good safety, and compact scale, and is of great significance for directional and detailed detection in wide coastal zones.