47ZK3 was designed in depth of 2570m in Luanjiahe gold field of Zhaoyuan, string dripping off occurred at the depth of 2297m. To speed up the accident treatment progress and decrease the loss, same diameter deflecting was made with eccentric wedging sidetracking to bypass the accident section. By the optimization of the technical measures of design, manufacturing and installation of eccentric wedging as well as selection of deviation bits and branch drilling bits, key technical problems were solved in eccentric wedging fixation and inclined plane passing procedure, the branch hole was extended to hole termination finally.