Abstract: Based on the analysis of present situation and characteristics of grain postproduction system in Zhejiang Province, a multi objective comprehensive appraisal model was used to evaluate seven treatment operations of grain postproduction system using four indexes, i.e., cost, efficiency, grain quantity loss and grain quality index on the basis of survey at Jinhua, Jiaxing and Ningbo in Zhejiang Province. By analysis of technology adaptability and discussion of critical equations for economic effect of machine unit, an analysis model of economic adaptability is put forward, and six typical harvest processes in Zhejiang Province including manual harvest and combine harvesters are analyzed. The results are useful to help farmers to improve or select mechanized harvest processes.