Abstract: During fracturing in Well AE3-Ping 26, the frac string broke off when it was driven with a twin packer, making sand blaster, packer and other tools buried in sands. It was difficult to fish these tools. Therefore, through analysis of the hole conditions and string lost in the well, appropriate fishing solution was prepared, and several workover tools were developed including sealed butter adapter for broken tubing, case mill shoe, and hydraulic pulldown. With these efforts, a lot of problems were solved, e.g. serious sanding-in of lost tools and irregular and varying fish top, contributing to the success of fishing. The practice provides valuable reference for fishing of string lost in similar horizontal wells.