The numerical analysis method has a high position in the geotechnical engineering field, the specialized finite different computer codes for geomechanics applications has an extensive application more. Currently, the compound soil nailing support for foundation fit have been more and more extensive adopted, but the existing theories and methods are not mature enough. The main characteristic and the design processes of this method are described in this paper. FLAC was employed to establish a model to simulate the foundation fit compound soil nailing support, the model simulates and analyzes the process of excavation discharge dynamically by the prestressed anchor-compound soil nailing support, through the numerical analysis, the distribution rules of horizontal displacement, vertical settlement, axial force and displacement of anchor and soil nailing, stress-strain of soil mass were obtained. The results of simulation were compared and analyzed with the actual results which were obtained by a practical engineering. The model established by FLAC could reflect mechanics and distortion characteristics of foundation fit. It is helpful to design and construction of the compound soil nailing support.
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