Based on review of research on suitable water levels for landscape functions and water demand for landscape environment, the concept and characteristics of the suitable water level for landscape functions of lakes are discussed. The suitable water level for landscape functions of lakes is affected by various factors, including flood control and drainage, municipal drainage, irrigation water supply, water resources of rivers and lakes, shipping, ecological water demand, and quantity of water diverted. In view of the landscape function of lakes and based on analysis of the main factors influencing the suitable water level for the landscape function of lakes during the flood season and dry season, quantitative calculation models of the suitable water level for the landscape function of lakes in the flood and dry seasons were established, through overall coordination of different functions of lakes. Then the suitable water levels for the landscape function of Wangmu Lake were calculated using the models. The results show that the modeled water level for the landscape function of Wangmu Lake in the flood season is 22. 5 m, which is higher than the water level needed for comprehensive utilization of water resources(21. 2 m). This modeled water level in the flood season not only improves the security of flood control and drainage, but also ensures the irrigation and shipping functions of the lake and existence of fish. The modeled water level for the landscape function in the dry season is 21. 9 m, with the distance between the leisure activity platform and the water surface being less than 0. 5 m, and the water quantity necessary for diversion into the lake being 9. 362×10⁶ m³. This water level not only helps optimize the water landscape, investment, and the water quantity diverted from other basins, but also ensures the feasibility of shipping and meets the requirement of minimum ecological water demand.