At present, Revit has great problems in the modeling of grid structure. The conventional manual modeling approach is almost impossible to complete, while adopting the conceptual mass modeling will lead to all the grid balls and bars the same type, which is not in line with the engineering practice. For solving the problem, this paper studies the modeling method of grid structure by using Revit Extensions and Dynamo software respectively, and focuses on introducing the application of visual programming tool Dynamo in Revit automatic modeling. For designers, Dynamo parameterizd tools are relatively easier to master. The Dynamo program developed in this paper can automatically generate an accurate grid structure model by reading data of grid structure. The size and location of the grid balls and bars are in accordance with the actual situation, and the efficiency of modeling and the quality of the model are improved.