Abstract: To effectively intercept incoming missiles, the impact initiation capability of shaped charge jets against thick-walled explosive charges has become a research hotspot. Standoff distance and impact angle are critical factors influencing the initiation performance of shaped charge jets. Based on the jet impact initiation criterion for bare explosives, this paper established a detonation judgment model for thick-walled PBX charges that incorporates the effects of standoff distance and impact angle. Through finite element numerical simulations, the influence patterns of standoff distance and impact angle on the shaped charge jet's ability to initiate thick-walled PBX charges were systematically investigated. Experimental tests were designed and conducted under varying impact angles and standoff distances to validate the jet initiation of PBX charges. The results demonstrate that as the impact angle increased, the initiation capability of the shaped charge jet decreased due to the increased equivalent wall thickness and reduced energy density transferred to the charge surface during initial jet interaction. Oblique jet impact initiation of thick-walled charges proved more challenging compared to vertical impact initiation of charges with equivalent wall thickness. For vertical jet impacts, the initiation stimulus factor first increased and then decreased with increasing standoff distance, revealing a critical standoff distance of 8D (where D denotes the charge caliber diameter). The model predictions show excellent agreement with experimental results, confirming its accuracy in predicting the initiation response states of thick-walled charges under varying standoff distances and impact angles.