In order to avoid the repeated import and export of models between professional softwares, as well as the loss of geometric elementsduring the export process, this paper proposes a method for BIM roaming video of linear engineering based on dynamic viewpoints. First, the basic characteristics of 3D viewpoint are explained, and combined with the feature of linear engineering, the overall technical route of roaming video production is studied; then the viewpoint parameters based on roaming requirements and the method of viewpoint generation during the roaming process are analyzed in detail; finally, based on CATIA modeling software, the BIM roaming function of linear engineering is designed and developed by Automation. The example shows that the program can realize the automatic export of roaming video materials, and has the technical advantages of high automation, convenience, efficiency, and low cost, which helps to quickly generate roaming video for design display.