Sandy silt and mucky silt clay were often encountered in deep excavation in Shanghai, Jiangsu Province and Zhejiang Province, support replacement is designed to be done in this case. But by the analysis and checking on the monitoring data of excavation enclosure deformation and support axial-force in a station of 1# Line of Hangzhou subway, support replacement was stopped using. By the engineering practice, it was proved that with the combination of information construction and practical situations, construction efficiency was largely promoted without support replacement, which could be the reference for the similar deep excavation engineering.