An Ocean Color CCD Imager (OCCI) has been developed. It has three bands with nominal spectral region 430nm-520nm, 580nm- 670nm and 760nm-860nm. It is composed of three separate subsystem, each for one band, which have the same structure and operate in push-broom mode with 1024-pixel linear array CCD detectors. The specifications and characteristics of the OCCI are given, low nose and high signal-to-noise ratio ensure the excellent ability of the OCCI to observe ocean color and coastal zone. Data processing algorithm including radiance correction, atmosphere correction and imagery rebuilding also have been developed.