‘Diversion enter city’ is a fundament in constructing ‘Waterfront City’. It plays an important role in enriching the urban landscape level and improving the quality of the environment and urban quality. Associated with the planning project of Mengjin channel passing through Wujiaqu city, the present paper suggested a planning idea of ‘landscaping by the water’ by means of ‘Diversion enter city’, on satisfying the requirement of flood control. Choosing history and culture as landscape design elements, the landscape units became the carriers of urban culture. The idea provides a theoretical guidance and technical support for planning landscape ecology, constructing eco-city garden, building civilized city, improving the quality of life, speeding up the economic development of this city.