The recrystallization of 2,6diamino3,5dinitropyrazine1oxide (LLM105) was studied. Results show that mean particle diameter, purity and impact sensitivity of LLM105 may be quite different by different crystallization methods. The products obtained by cooling crystallization and solvent (DMOS)nonsolvent(hot water) crystallization have low impact sensitivity, the value of H50 are 120.0 cm and 108.3 cm. Thermal properties of LLM105 were studied by DSCTG, VST, TG and thermal explosion test. Thermal properties parameters of LLM105 are shown respectively: DSC exothermic onset temperature is 341.2 ℃ (heating rate 10 ℃·min^-1); VST: 0.016 mL·g^-1/120 ℃/48 h; loss of weight: 0.13%/120 ℃/48 h; thermal explosion temperature for 5 s explosion delay is 367.5 ℃. The results of VST show that LLM105 has good compatibility with HMX, AS, F₂₃₁₁, F₂₃₁₄ and estane. Measured detonation velocity of LLM105 (LLM105/F₂₃₁₄=95/5, 1.845 g·cm^-3, 96.4% TMD) is 7991 m·s^-1. The experimental results of pressuredensity curve show that LLM105 has good pressingmolded property.