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In view of poor water lateral infiltration into the centers of wide beds under the system of PRB conservation tillage, three structural kinds of cutters including flat cutter, twoedge cutter and Vshaped cutter were designed respectively based on soil mechanics model. To get strength checking and comparative analysis, ANSYS software was adopted to analyze the cutters. The stress of the cutters applied was calculated based on pureshear and twowedge models, and got the stress pattern and deformed shape. The results showed that all of these cutters’ strength met the demand, and deformed shape was very small. With AHP and effect coefficient methods, and using theoretical resistance, operation fuel consumption and soil moisture as evaluation indexes, Vshaped cutter was found to be the most suitable considering the integrated benefits.