Abstract: Simultaneous fracturing of horizontal well groups is a core technology for deep coal reservoir development, where fracturing methods and parameter selection significantly influence fracture propagation patterns and morphology. Therefore, fracture propagation mechanisms and stimulation effects under aligned and staggered fracture layouts in deep coal reservoirs are systematically investigated via hydraulic fracturing numerical simulation. It specifically analyzes the impact mechanisms of key parameters such as horizontal stress difference and injection rate on fracture morphology and reservoir stimulation efficiency. Through quantitative evaluation of different layout adaptabilities combined with two-cluster fracturing patterns, the research provides theoretical support and technical references for efficient deep coalbed methane development. The findings reveal: During fracturing, the inter-well mid-region experiences complex stress states under combined fracture effects. When oppositely propagating fracture tips approach, their stress shadows overlap and superimposed tensile stresses at the tips reduce forward stress. Stress variations intensify near fracture tips with evident stress concentration, gradually diminishing with distance from fractures. Increasing stress difference promotes X-directional linear fracture extension. Compared with aligned layouts, staggered configurations gradually weaken inter-cluster stress interference through offset arrangement, transitioning fracture propagation toward dispersed stimulation within single clusters. Overall, low stress differences enhance local complexity optimization through natural fracture synergy, while high stress differences limit propagation efficiency through linearization tendencies. Comparative analysis shows staggered layouts increase fracture area by up to 25.69% versus aligned patterns (at 3 MPa stress difference and 0.005 m³/s injection rate). Thus, staggered layouts prove superior for dual horizontal well simultaneous fracturing, leveraging inter-well stress interference to create complex fracture networks and significantly enhance hydraulic fracturing effectiveness in deep coal reservoirs.