With the characteristics of loose structure， high water permeability， low cohesion and poor self-stability. sandy gravel formation often brings many problems to the field work. In order to better research the ground subsidence laws and corresponding control measures during trenchless pipe jacking in sandy gravel formation， this paper takes the pipe jacking section W31-W32 of the rainwater and sewage pipe network in the areas of Huayang， Wan’an and Zhengxing in Chengdu city as the research object， and puts forward the ground subsidence control measures suitable for sandy gravel formation by means of construction method comparison， numerical simulation and field measurement， The results show that in the sandy gravel formation， reinforcement of soil around the pipe by sleeve valve pipe grouting and reinforcement of the pile portal by high-pressure jet grouting are proper and effective with the ground subsidence after reinforcement reduced by 48.1% compared with that without reinforcement， and the surface subsidence at the portal reduced by 51.1%， meeting the requirements of ground subsidence control； which verifies the effectiveness of formation reinforcement measures. It can provide reference for subsequent similar pipe jacking in the future.