Abstract: A new, simple algorithm of counting and segmenting cell image is suggested in this paper. It is based on the feature of cell's logical and morphological information. By using of mathematics morphological logical operation and laplacian filter, the method is realized with the MATLAB 5.10. Specially, first, it gets the logical and morphological feature of blood cell image with logical and morphological operation. Then, distinguishes the segmented cells from their background according to this feature, and at the same time this method can segment special blood cell from its neighborhood. Particularly does this method can count the number of blood cells, however, this counting is not very accurate. In this article the segment effect of this algorithm is tested with blood cell image and the result is desirable. It is very useful for cell image where the cells don't contact closely.