Abstract: With deep development of the gas reservoirs of Penglaizhen layer in western Sichuan, formation energy is continually falling. Some problems have cropped up during fracturing process, including flowback rate dropping and fracturing fluid filtrate invading seriously, which restrict efficient exploitation of shallow layer Penglaizhen gas reservoirs. Based on the research of performance requirements of the fracturing fluids, technical countermeasures was proposed to reduce fracturing fluid damage to reservoir, and improve the development benefits of gas reservoirs. Finally, the two low damage fracturing fluid systems: ultra-low concentration thickener fracturing fluid system and linear fracturing fluid system are formed, which are suitable for Sichuan Penglaizhen gas reservoir and widely applied in western Sichuan Penglaizhen. Flowback rate are 65.1% and 61.9% respectively, average production are 0.81×10⁴m³/d and 1.45×10⁴m³/d respectively after fracturing. The significant effect for increasing yield is achieved.