A composite sample of CL-20 and dihydroxylammonium 5, 5'-bistetrazole-1, 1'-diolate(TKX-50, HATO)was prepared by in-situ crystallization method in aqueous suspension of CL-20 using 1, 1'-dihydroxy-5, 5'-bitetrazole(H₂DHBT)and hydroxylamine aqueous solution as raw material through neutralization reaction. The morphology and structure of the composite were characterized by scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FT-IR), nuclear magnetic resonance(NMR)and X-ray diffraction(XRD). The effect of different processing conditions on the morphology of the composite was studied. Thermal property was analyzed using DSC. Its impact and friction sensitivity were measured with GJB772A-1997 method. Its detonation velocity was calculated using Urizar 's formula. Results show that the technological conditions for obtaining CL-20/HATO composite sample with uniform adhesion are:reaction temperature 90 ℃, reaction time 10 min and dropping rate 60 mL·min^-1 of NH₂OH aqueous solution. The crystal form of CL-20 in prepared CL-20/HATO composite sample does not change. The mass ratio of CL-20 and HATO in CL-20/HATO composite obtained by quantitative carbon spectroscopy is m(CL-20) :m(HATO) =55:45. The temperature of thermal decomposition of the complete is 238.3 ℃ and 250.7 ℃. Its characteristic drop height is 44.7 cm, the probability of impact explosion is 52% and the probability of friction explosion is 76%. Theoretical detonation velocity of the composite sample is 9516 m·s^-1.