Abstract: Two-dimensional DEM (the Discrete Element Method) analysis model of seeds and precision metering device with combination inner-cell was established, to investigated the clearing process in the precision metering device using DEM, then the performance of clearing process in various precision metering devices was analyzed through changing the DEM parameters and CAD model (CAD software design) of the precision metering device. Feasibility and advantages for analyzing performance of precision metering devices by DEM were validated through comparing results of DEM simulation and analysis and experiment, through which a new method for studying and designing of precision metering device was put forward.