Abstract: Because of the cloud barrier in a remote sensing image,the information couldn't be captured.Based on spline curve,a proposed method kept the continuity between inner and outer edge of cloud and captures more details in the remote sensing image without previous information.Firstly,the brightness in the cloud region was stretched.Secondly,the more details in the cloud region was exposed after the convolution between the cloud region and a high pass filter.Thirdly,the brightness of the pixels in the cloud region was improved with histogram stretching method.The results show the more details,such as the wall of dam,water stream can be exposed in a remote sensing image in which over a quarter of whole size was covered black cloud,which means the image enhancement technology is multiformity.