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Corn harvester divider has a direct impact on maize seedling conveying, it is an important factor to influence the harvester operation. Corn straw physical property and max transverse offset distance were measured by experiment in corn filed and max offset angle was accounted. The relation equation between divider width and corn plant bending property was acquired by data process. An important factor on effecting dividing and conveying plants was found, that was the bending property of corn plants. A basis was provided for the divider design. It is interpreted in theory that the higher divider positioned the slighter the plants damaged. The difference between bending strength of different regional corn plants was compared and analyzed. In the optimum harvest period, corn plants resistance to bending in Shandong Province and Beijing regional was stronger than it in Jilin Province.