Abstract: In view of the production needs of modern large-scale agriculture to save cost,improve quality and increase efficiency,focusing on the key technical links such as rice harvesting technology,harvester structure and intelligent detection in Jiansanjiang,the techniques and methods of post-harvest mechanized harvesting and grain saving in Jiansanjiang were systematically studied with the main goal of grain saving and loss reduction.The actual harvest plots of typical rice farms in Jiansanjiang were compared and analyzed.The water content,1000-grain weight,unit yield and crack increase rate were used as indicators to evaluate the effect of grain saving and loss reduction.The experiment showed that the two-stage harvest method was superior to the direct harvest method,which was suitable for the technological requirements of grain saving and loss reduction in northern rice.