Abstract: A three-dimensional chimera grid-embedding technique is used for complex configuration. The technique simplifies the construction of computational grids about complex geometry.The method subdivides the physical domain into regions which can accommodate easily generated grids. Communication among the grids is accomplished by interpolation of the dependent variables at grid boundaries. An chimera grid-embedding scheme is implemented for a C-5A wing/body/pylon/nacelle. Numerical results show that the present algorithm is stable, accurate, and can be used effectively to compute the flow field about complex configuration.