For registering multi-sensor remote image automatically, a new kind of virtual point based on line feature is proposed as a basis of point features and control points. Taken optical images and SAR images of airport as example, a multi-sensor remote image registration algorithm based on virtual points is proposed. The common features shown in two kinds of remote images, i.e. line features are extracted in different ways as the characteristic of each image firstly. Then virtual points are constructed on the basis of line features in each image, and used as the control point candidates in the process of image registration. The automatic coarse-to-fine registration between the two kinds of remote images is realized by two steps: the coarse registration based on feature consistency and the fine registration based on virtual points. Experimental results show that the proposed algorithm is robust and accurate, and realize the coarse-to-fine registration between optical and SAR images automatically.