Abstract: The main engineering problems were represented in the paper: developing faults, fold strata and unclear belt of Xiangfan-Guangji fracture. In elementary period, comprehensive geological methods were applied in the exploration of the bridge site at the same depth for different samples. As a result, no belt of Xiangfan-Guangji fracture was prospected, and only two faults were found at K80+530 m and K81+860 m. The F₁ fault of them had a great influence on the three-tower rope scheme, while the F₂ fault in the south bridge approach had little. So, the scheme of rope bridge was better if only geological conditions were considered. If the sample of stiff bridge was selected, the middle tower must be moved to the south.