The experimental software for connting interference fringes could accomplish the auto-sampling and counting moving fringes. The software accomplishes sampling interference video through PCI high-speed capacity of data sampling and transmitting, and exerts the digital image algorithms to identify and locate the fringes. The software combines with many algorithms in various stages, achieves better effect. It could overcome many disadvantages which survive in manual watching and measuring interference fringes in optical experiments, and could trace moving fringes in real time and auto-count the fringes,could facilitate students to accomplish experiments that measure some physicalquantities by the laser interference fringes.