Abstract: Power Take Off （PTO） is a key component in power transmission route of rice transplanter.In order to explore the structure and working principle of PTO,reverse modeling of PTO chassis of Yanmar VP-6D transplanter based on 3D scanner and Geomagic Design X was carried out.The methods of acquisition and processing of model point cloud data,model establishment and error analysis,format conversion and model assembly were elaborated.The modeling error detection of the reverse model is also carried out.The test results show that the average modeling deviation of upper and lower shells is 1.056 5 mm and 1.032 5 mm respectively,which provides a reference for PTO follow-up study and optimization design.