Abstract: According to the fact that it is difficult to build contact element in FLAC3D of complicated models, a new model-building method of contact element named"model plane first then contact plane"is discussed. This method is suitable for the whole process numerical simulation of civil engineering. It is used in a actual simulation analysis of engineering and is proved to be effective and practical. This building method has a reference value for FLAC3D modeling of contact element in the future.