Compared with factors causing the change of water environment, the effect of landscape water is likely to be neglected. If focuses on the method of evaluating several items of water quality, as well as the investigation of aquatic plants and the microorganism to investigate a practical case of an artificial water area using landscape water. The results show that although the artificial wafer area has been connected with the natural river, the water quality presents obvious deterioration. This demonstrates that the effects of the utilization of landscape water on the water environment should be paid more attention.