Abstract: Bicubic interpolation is a classical algorithm used in spacial transformation of image such as image rotation and zooming.It provides better visual effect than bilinear interpolation when they are used in digital image processing，but its performance is lower.In order to improve its performance，this paper proposes bicubic convolution template algorithm：make the bicubic interpolation discrete and infer 16 templates，in which the original real operations are replaced by integer operations.The transformed pixel grey value is the convolution of the template and the grey value of the neighbor pixels.Experiments demonstrate that the image quality rotated by the proposed algorithm is better than bilinear interpolation and is a little worse than bicubic interpolation.Its performance equals to that of bilinear and is obviously higher than that of bicubic interpolation.