In flourishing cities,imperative that transmission lines and distribution lines be buried in the ground.Jacking pipe with small curvature radius for cable tunnels can effectively solve the problems of route selection in urban,and it will be widely used in constructing cable tunnels and other municipal tunnels in urban areas.Curvature radius of pipe-jacking tunnel has a great influence on the mechanical behavior of jacking pipe and surrounding soil response,and it is an important factor to control the development of the curve pipe jacking,but the relevant researches are insufficient.This paper discusses how the curvature radius influences surface settlement,lateral earth pressure,dislocation of segments and pipe reinforcement stress in the process of jacking pipe by establishing three-dimensional(3D)finite element model.Results show that as the curvature radius decreases from 180m to 90m,the surface settlement,lateral earth pressure,dislocation of segments and pipe reinforcement stress increase more than doubled.And when the curvature radius is 120m or less,stress distribution at the joints of pipes is not evenly distributed and tensile strain of concrete in the internal of pipes and in the range of joints reach ultimate tensile strain.And when the curvature radius is 90m or less,the maximum dislocation of segments is more than 20mm,which is not allowable in China.Some solutions are proposed in the end of this paper,which may provide reference for similar projects.