The existing evaluation method of flushing fluid has some problems in evaluating the oil-base drilling fluid. This paper presents a new indoor evaluation method which would be suitable for evaluating both oil-based and water-based drilling fluids by using the principle of equal shear rate between annular wall and inner cylinder wall of improved device. Many indoor simulation experiments have demonstrated that this method can reflect flushing efficiency better; and by this method, the simulation evaluation can be made on influence of flushing efficiency to cementing conditions in the first or second bonding interface. This method has the advantage of convenient operation and is suitable for both water-based and oil-based drilling fluid cementing conditions.