Abstract: The Panhai Bridge is a single-tower, four-cable plane cable-stayed bridge with pylons and beams. In order to ensure the safety of the structure, the main girder is constructed by asymmetric cantilever pouring, and the line shape and stress of the bridge vary greatly. Therefore, it is necessary to adjust the bridge's performance by unbalanced counterweight and externally applied temporary prestressed beams under the premise of ensuring the safety of the bridge structure construction balance. For this reason, this paper proposes an asymmetric cantilever construction technology for the main girder of a four-cable plane cable-stayed bridge with a single tower and no need of counterweight and temporary prestressing. That is, the west side of the main beam full hall bracket is fi rst erected, and the main tower section is poured at the same time, and then the east side sectioned hanging basket cantilever construction is carried out. The engineering example shows that in the case of complex terrain, the use of asymmetrical cantilever construction of the main girder can not only meet the requirements of structural design specifi cations, but also shorten the construction period, reduce the project cost and construction diffi culty, and ensure construction safety.