The three-dimensional （3D） geographic information system can provide users with intuitive two-dimensional （2D） or 3D visual simulation scenes.The rocket ground safety control system can achieve the safety control during rocket flight by setting reasonable safety pipelines.In response to the safety control work during rocket flight and the requirements for fine display and judgment of flight situation information，the 3D geographic information system is applied to the rocket safety control situation judgments，allowing the 3D geographic information system to receive the rocket’s real-time flight data and display the rocket’s flight situation throughout the entire process.The coordinate system conversion algorithm and the object collision detection algorithm in 3D space are investigated and implemented to calculate and display the position relationship between the rocket and 3D safety pipelines in real time，by which the intuitive and accurate visualization scenes and automated safety control situation decision-making results are achieved.With the information，the safety control commander can carry out timely and accurate ground safety control judgments and implementation，and achieve the maximum safety protection for ground targets.