The two oxidative systems of Cu²⁺/H₂O₂ and Fe²⁺/H₂O₂ were adopted to degrade unsymmetrialdimethy hydrazine (UDMH) wastewater to study degradation efficiency and mechanism, and the impacts of the four factors: pH value, temperature, time and oxidant dosage on the degradation rate of UDMH wastewater were studied. UV-vis method was applied to analyze the oxidative degradation products of UDMH. The mechanism of oxidative degradation of UDMHwas discussed, and the degradation products of two systems at pH 3, 5, 7, 9 were comprehensive comparative analyzed. Results show that the two factors temperature and oxidant dosage have little effect on the degradation rate of UDMH, but pH has great influences on the degradation rate of UDMH and pH is the main factor controlling the type of degradation products of UDMH. The systems of Cu²⁺/H₂O₂ and Fe²⁺/H₂O₂ have the similar degradation products, which are less produced under acidic condition than alkali and neutral conditions. The system of Cu²⁺/H₂O₂ has a relatively high degradation rate on UDMH but many in-process products under alkali condition, and the system of Fe²⁺/H₂O₂ has high degradation efficiency and few in-process products under acidic condition.