Abstract: Chinese small satellite constellation(abbreviated HJ constellation)is special for environment and disaster monitoring and forecasting. The satellites HJ-1 A/B have the feature of wide coverage，which can be widely used in the ecological environment and disaster monitoring. The traditional positioning model can’t get ideal accuracy because of the CCD feature of wide coverage. It has significant error in CCD linear array direction. The reason is that the error factors changing with the field of view are not taken into count. Therefore，camera distortion model of CCD camera is considered and improved distortion model based on polynomial is used for image positioning in this thesis. The experimental results demonstrate the proposed algorithm improves the RMSE in CCD linear array direction is obviously reduced. The improved method has great significance to improve the positioning accuracyof HJ-1 CCD image and promote the use of domestic wide coverage satellite images.