In order to study the settlement regulation and control measures of shield tunnels underneath traversing existing dual shield tunnels in gravel layer, the precedent project that dual shield tunnels of Subway Line 16 traversed shield tunnels of Subway Line 4 in Beijing was taken as an example. By analyzing the numerical simulation and in-situ monitoring data of settlement, the settlement variation trends of existing tunnels caused by traversing construction were clarified. Meanwhile, adaptive transformation of the shield machine was discussed. And the experience of shield construction parameters control was summarized. Research shows that: 1) The shield machine must improve its abrasion resistance, and add grouting system and foaming system in order to accommodate the gravel layer. 2) The settlement of existing tunnels is relatively large in the range when shield machine is traversing. However, it is small before shield machine arrives and after shield machine traverses.Meanwhile, the settlement of existing tunnels is obviously affected by the secondary disturbance of successive construction. 3) In order to restrain the settlement of existing tunnels effectively, the shield construction parameters must be controlled in real time according to monitoring data and parameters of thrust force and working chamber pressure must be kept high relatively. Meanwhile, quality of grouting must be ensured by enhancing grouting pressure.