The Qixia Formation of Shuangyushi structure in northwestern Sichuan Basin is an important strata for increasing reserve and production of natural gas in the Sichuan Basin. However, the difficult drilling strata represented by Xujiahe Formation in this block were faced with the bottleneck problems such as difficult rock breaking, fast wear, low ROP and short footage of a single bit, which seriously restricts the drilling speed and the overall exploration process of Qixia Formation gas reservoir. The outcrop rock samples and cuttings from the lower Xujiahe Formation (X2 and X1) were selected to carry out the analysis experiments of rock drillability, abrasivity and anti-drilling mechanism. The results show that the average drillability grade of the tested rock sample were 8.45, while all the sample of X1 Formation reached the highest grade 10. In addition, the average grinding amount of the standard bar were 16.26mg, showing extremely strong drill resistance. Analysis considered that the low porosity and permeability, high quartz content, high cementation strength, compressive strength and hardness in the lower Xujiahe Formation were not conducive to rock breaking with impact and cutting of bit and hydraulic assisted, which was the main reason for the low ROP. Macroscopically high strength and hardness, as well as the strong abrasion of drilling cuttings in micro scales were not only the key factors leading to the impact failure and grinding failure of the bit teeth, but also the key direction of the subsequent research and selection of drill bits.