Aiming at the characteristic of the image contour information extraction,the gene coding algorithm is proposed. Firstly,the pixels are mapped to individual gene expression,image contour features are distinguished by using gene encoding values,then each gene encoding feature of the pixel is selected,and the feature is extracted,finally the image contour feature information extraction algorithm is given. The experimental simulation results show that the extracted image contour with gene encoding is very clear,and the algorithm has strong anti-noise ability and quick response. The edge retention index is close to 1.