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A hybrid mesh based finite volume compressible flow code (PolySim) has been developed recently.Instead of the simple average method for the gradients of variables at each face, the volume average is applied for the calculation of the viscous flux.What is more, an improved Green Gauss method for the calculation of the gradient is also presented.These two techniques will improve both the accuracy and robustness of the code.The aerodynamic performance of this in-house cell centered code is examined by several widely-used bench-mark test cases.These cases include flows over flat plate and RAE 2822 etc.The comparisons on results between calculation and experiment are conducted.They show that the code can produce good numerical results which agree well with the corresponding experiment data.