Abstract : This paper proposed a digital image processing system design based on MATLAB,which includes histogram transformation, grey level transformation ,image smoothing and covers some processing algorithms in the fields. Designed a friendly graphical user interface(GUI),witch is easier to realize the presentation of the system and observe the results and understand the algorithms, Achieve the visualization in image processing teaching. Using the MATLAB image processing toolboxes to realize the main functions,the interface friendly and interactive,students can understand and learn the knowledge of image processing systemic and sentimental processing algorithms in the fields.