Abstract: The levelness and flatness of the hot bed platform in FDM type printers are important prerequisites to ensure the smooth printing of the molded parts. In view of the gradual deformation of the hot bed heating and the difficulty of obtaining a good first layer, ANSYS is used to perform thermal-mechanical indirect coupling of the hot bed platform. The deformation process was simulated by simulation. The BL touch contact sensor was used to collect 15 point data on the surface of the irregular hot bed in real time. The Lagrangian and bicubic interpolation algorithms were used to interpolate the curvature of the sampling points, and the generated mesh bed was triangular. Then, the thickness of 1mm is given and the slicing algorithm is used to form the compensation substrate code. On the dual-nozzle printer, nozzle 1 uses water-soluble PVA material to print the substrate in a supported form, and nozzle 2 prints the solid model. The experimental results show that this method has a simple principle and can remove the Compensation materials are convenient, and the printing model accuracy is improved, especially for the easily deformed hot bed of large FDM printers.