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Though Computational Fluid Dynamics has been extensively utilized,the issues of precision of the numerical value which can not be provided exactly still remain to be solved.In this paper,a precision-analysis model is provided to verify the reliability of the numerical values.Error coefficients of different difference schemes are presented,and a detail discussion of the relationship between the grid Reynold number and maximum error is provided.That the assumption about the precision of numerical value constringe along the grid is not preciseness is demonstrated.Modification of the governing equation rest on the construction of the precision-analysis model is advanced.