Abstract: Using the precision planetary gearbox as the research object has been taken into consideration, including the influence of the centreline deviation on the transmission error and tooth surface load. A three-dimensional model for the precision planetary gearbox was established and KISSsoft software was utilized for the analysis of the offset. The distribution of the tooth surface load and the transmission error of the planetary wheel system under different offsets was obtained. Finally, in combination with the torsional bending combination deformation with the support device under the actual working conditions, a gear combination shaping method was proposed. By arranging the combination increment, the optimal solution was obtained and the gear meshing performance and the transmission performance of the planetary system were compared before and after the optimal shaping. The shaping method was found to reduce the tooth flank bias load due to the centreline deviation and improve the transmission error, which provides a reference method for the gear shaping under the consideration of the centreline deviation.