对粘性流动计算 ,提出有限离散单元流动的流体分析 (理论 )和耦合离散流体理论 (CDFT)的差分格式 .利用CDFT差分格式计算Burgers方程和计算激波边界层干扰流动的数值实验表明 :对计算精度和计算效率的提高 ,CDFT格式比提高常用差分格式 (即离散流体力学方程得到的格式 )精度和改进常用格式形式等更有效 ,且运算量小 . For the calculation of viscous flow, a finite difference scheme of fluid analysis (theory) and coupled discrete fluid theory (CDFT) of finite discrete element flow is proposed.The numerical experiment of calculating Burgers equation and calculating interference flow of shock boundary layer by using CDFT differential scheme shows that: Accuracy and computational efficiency, CDFT format is more effective and less computationally expensive than improving the accuracy of common differential format (ie, the format obtained from discrete hydrodynamic equations) and improving the common format format.