In order to realize information construction on settlement of pile-group foundation of Sutong Bridge,the monitoring instruments of high-precision micro-pressure sensor and hydrostatic leveling and settlement profiler were integrated synthetically.A set of practical multi-scale monitoring system on settlement of super-large pile-group foundation in deep water was put forward.The reliable settlement results are obtained by means of multi-sensor data fusion.Finite element model of pile-group foundation is established.By analysis of finite element simulated calculation of pile-group foundation,rules of settlement and uneven settlement obtained by monitoring and calculation results are coincident and the absolute error of settlement between them is 4.7 mm.The research shows that it is reasonable and feasible to monitor settlement of pile-group foundation with the system,and it can provide a method for the same type pile-group foundation in deep water.