Abstract: This paper presents the application of hydra-jet fracturing technology used in a well with three layers casings at the target interval but without perforation. According to the geologic information and its special well-structure, the authors optimized the down-hole tools assembly and worked out the detailed hydraulic parameters and operation process. The implementation results showed that the three layers casing was penetrated and 43 m3 proppants were delivered into fractures smoothly. There is no literature publishing about this technology applied in such structure wells. The research in this paper will be able to provide a new approach and detailed references to stimulate such wells as with multi-layer casings.