In order to accomplish the requirement of large scale focal plane and high resolution during the development of space based remote optical sensors, we developed a focal plane pointed technique. First, we designed a transmission telescope with large focal plane. Then, we proposed a mechanical interleaving assembly method to achieve the required scale of focal plane. Besides, the function principle and some key techniques of the focal plane pointed telescope are analyzed. Finally, images are gained using the telescope and the system errors are discussed as well. Experimental results indicate that the pointing stability should be better than 1.6 mrad and the flatness of the focal plane should be confined in 20 μm. The focal plane pointed method can satisfy the system requirements of large scale focal plane.