To elucidate the energy deposition mechanism of electro-chemical coupled explosion and provide a scientific basis for parameter optimization and precise control of related devices， an experimental platform was established to systematically investigate the effects of aluminum wire diameter （0.1-0.4 mm） and initial charging voltage （25-40 kV） on the detonation of HMX driven by electrical wire explosion. The results reveal that the electro-chemical coupled explosion comprises four characteristic stages： wire vaporization and plasma expansion， HMX ignition， HMX detonation， and disintegration of the detonation-product conductive channel. A quantitative criterion system for identifying mechanism transitions was established by defining the energy fraction in the HMX detonation stage （η_Ⅲ=E_Ⅲ/E_total） and the power peak ratio （γ=P_p2/P_p1）. When η_Ⅲ > 90% and γ > 0.5， the system operates in the HMX-dominated “electro-chemical coupled explosion” mode； when η_Ⅲ decreases to 70%-80% and γ <0.2， it transitions to the Al-dominated “electrical explosion” mode； when η_Ⅲ≈0， γ≈0， and current oscillations disappear， it enters the resistance-dominated “capacitive discharge” mode. The wire diameter governs the fundamental transition of energy deposition mechanisms by controlling the effective vaporized and ionized mass fraction of aluminum. As the diameter increases from 0.1 mm to 0.4 mm， the energy release mechanism sequentially undergoes the three modes described above. The initial charging voltage regulates the intensity and efficiency of the coupled explosion through a power density enhancement mechanism. Increasing the voltage from 25 kV to 40 kV boosts the first power peak by 3.2 times， shortens the ignition delay by 62%， increases the energy deposited in the HMX detonation stage by 3.0 times， and raises the total deposited energy by 3.3 times. This study demonstrates that enhancing the efficiency of electro-chemical coupled explosion requires a combined strategy of reducing the wire diameter and increasing the initial charging voltage. The established quantitative criterion system and synergistic regulation laws provide a critical scientific basis for parameter optimization and precise control of electro-chemical coupled explosion technology.