4 obstacle pile removing methods are compared, with the removing of the obstacle piles along the route of a shield-bored tunnel of Line 2 of Xi'an Metro as an example, and, in the end, the method of "foundation pit cutting and pile removing by impacting" is adopted. The key points and key technical measures of "pile removing by impacting method" are presented in the paper. The engineering practice demonstrates that the construction method adopted is simple, easy to execute, safe, reliable and time-saving. The experience can be served as reference for similar projects in the future.