Abstract: With the continuous progress of science and technology and the advent of the age of intelligence, the proportion of urban water engineering planning and construction is increasing. Focusing on the water conservancy project under the complex urban environment, the integrative geophysical method is used to detect the underground pipelines and underground obstacles, which makes up for the defects and deficiencies of the traditional detection methods. Specific solutions and measures are provided, which has achieved good results in practical application. This research has practical significance in the optimal layout of water engineering lines, economic rationality of design scheme and safe construction.