Abstract: In order to shorten the development cycle of visual navigation system for harvester and reduce image processing algorithms test cost, after illustrating the DaVinci technology software framework and analyzing the working principle of video codec based on H.264, a system based on DaVinci technology was developed to test image processing algorithms of visual navigation system in harvester. Digital video DM6446 dual-core processor as the core, the system realized two function blocks based on DaVinci technology, the first of which was the video of field experiment encoding and acquisition, and the second was indoor test of video decoding and image processing algorithms. Experimental results showed that the system had advantages of steady performance and high real-time with the encoded video compression ratio up to 47-103 times and the decoded video frame rate 30 s-1, and many image processing algorithms could be tested simultaneously. The system provides effective analysis method for image processing algorithm of visual navigation system in harvesters.