As the course covers a wide range of content and needs lots of algorithms, students find it quite difficult. To solve these problems, as we found out that most algorithms in digital image processing has clear input image, input parameter and output image, this paper has come up with a teaching software of digital image processing experiment. In the software, every algorithm is designed as a module in the whole process. A digital image processing experiment can be accomplished by selecting different modules with given attributes and then be linked together. The software has a high degree of efficiency and has been well applied in experimental teaching.