In order to obtain a CL-20 based energetic film that can be reliably detonated at the micrometer scale， hexanitrohexaazaisowurtzitane （CL-20）， ethyl cellulose （EC） and poly azido-glycidyl ether （GAP） are selected as the main explosive and bonding system respectively， two ink formulations suitable for the micro-spray direct writing process have been designed and formulated with adding an appropriate amount of low-boiling solvent. The two ink materials are directly written by a double-nozzle microjet direct writing device. The molded samples were characterized by scanning electron microscope， MZ-220SD electron density meter and X-ray diffractometer. The impact sensitivity， thermal decomposition performance and critical thickness of the entrapped film were investigated. Results show that CL-20 based energetic film has a smooth surface and many tiny pores inside， the microstructure size is about 1 μm. The crystal form of CL-20 in membrane is ε type. The forming density of the energetic film is 1.547 g·cm^-3， reaching 79.2% of the maximum theoretical density. The apparent activation energy of thermal decomposition and drop height （impact sensitivity） of CL-20 based energetic film is 241.21 kJ·mol^-1 and 65.7 cm apart， which are both improved compared with raw material CL-20. The critical detonation thickness of the energetic film is 1.0 mm×0.045 mm， demonstrating excellent microscale detonation capability.