To address the challenges of high compressive strength，low drillability，and extended drilling time in the deep tight shale of the Mabei Fengcheng Formation，an experimental study on drilling parameter optimization for axial-torsional coupled percussive drilling was conducted. This study intended to identify the dominant factors affecting rock-breaking efficiency and to establish a parameter matching method suitable for this layer. Using a composite percussive rock-breaking efficiency testing device，drilling experiments were performed on core samples from the target layer under fixed conditions of weight-on-bit and rotational speeds with different combinations of axial and torsional impact frequencies. The effects of impact frequency on rate of penetration （ROP），torque，and mechanical specific energy （MSE） were evaluated. The results show that axial-torsional coupled impact can significantly increase the ROP while reducing torque and MSE. High-frequency torsional impact plays a dominant role in torque reduction and energy saving，and a synergistic rock-breaking mechanism was identified in which axial impact promotes crack propagation，whereas torsional impact alleviates bit sticking. This study confirms that axial-torsional coupled impact technology provides significant benefits in improving drilling efficiency，reducing torque，and lowering energy consumption in this shale formation. The obtained parameter optimization method provides a theoretical basis for field drilling design and offers important engineering guidance for accelerating drilling in deep hard strata.

Enhancing the rate of penetration （ROP） is crucial for optimizing the efficiency of oil and gas development and deep exploration in China and ensuring national energy security. The percussion rock-breaking drilling technology has been applied in oil fields at home and abroad，resulting in significant improvements in ROP. Further research efforts are expected to address the technical challenges of low drilling footage and limited ROP enhancements encountered during deep exploration of hard rock formations with high temperature and pressure. This paper presents and analyzes the practice and development trends of the drill bit percussion rock-breaking drilling technology assisted by axial percussion，torsional percussion，and axial-torsional coupled percussion. It illustrates that the percussion-assisted drill bit rock-breaking mechanism is the core of percussion rock-breaking ROP improvement technology. This paper also reviews the scientific advancements made by domestic and overseas research scholars in physical experiments，theoretical modeling，and numerical simulation of percussion-assisted drill bit rock-breaking. In addition，it offers relevant proposals for the development of percussion rock-breaking ROP improvement technology，i.e. advancing research on material structure optimization design，intelligent control，integration of multiple technologies，and optimization of well applications. This is expected to provide valuable insights for enhancing the drilling efficiency in energy development of our country.