In order to study the direct write explosive charge methodology applied in micro electro mechanical system (MEMS) fuze security and insure devices, an explosive ink composite of direct write was developed with fine 2, 4, 6, 8, 10, 12-hexanitro-2, 4, 6, 8, 10, 12-hexaazaisowurtzitane(ε-CL-20)and binder system of polyvinyl alcohol (PVA)/H₂O/ethyl cellulose (EC)/isopropyl alcohol (IPA), in which CL-20 was fined by ball milling. And its properties were characterized. Results show that the line width of direct write for the explosive ink is 80.2 μm with no obvious crack by scanning electron microscope (SEM).The crystal polymorph of CL-20 keeps the ε-polymorph before and after direct write by Fourier transform infrare spectroscopy (FTIR). The critical size of detonation is 0.36 mm with 0.54 mm loading thickness by wedge shaped charge test.