Experts diagnose plant diseases and insect pests via long-distance video is a new and effective way for prevention and cure. Jabber based on XMPP. So there are good communication, standardization and expansibility in Jabber. This thesis gave a method which was long-distance video diagnosis based on Jabber. First, VFW was used to capture video of diseases and insect pests. Second, H.264 compressed the video. Third, compressed video was transmitted and controlled by Jabber. Finally the compressed video was decoded and showed in other end. Client used Delphi as developing tool and Sever used Jabber2.0 realized this design.