Abstract: With the increase of wheat yield, the possibility of wheat lodging increases. Therefore, solving the problem of wheat lodging resistance has great significance for the increase of wheat yield. Simplifying wheat stem at wax ripeness as rigid/elastic material, its basic law of stress under the wind load was studied. The lodging resistance mechanical model of deadweight of wheatear under the wind load was established by using vibration theory. Finally, based on this model, the lodging resistance wind speed of Zhoumai 18 and Aikang 58 were calculated by the experimental data in 2013. The calculation results of lodging resistance wind speed agreed with the data from literature, which indicated that this model could provide certain theoretical basis for lodging resistance of wheat.