Boulders in residual granite soil can induce difficulties in tunnel construction. At the exit section of Xiangshan tunnel on LongXia railway, there are plenty of boulders in residual granite soil. Besides the heterogeneous ground, this section of Xiangshan tunnel also has the adverse conditions of shallow cover and ground water. The author introduces the difficulties in the construction and analyzes the causes. Furthermore, he presents the improved construction methods and measures in detail. This paper can provide references for similar projects.