The melt point, crystal shape, structures and interaction of different mole contents of methyl-nitroguanidine and hydrazine nitrate were tested by differential scanning calorimeter(DSC), optical microscope, X-ray diffraction(XRD) and density functional theory respectively. The experimental results show that the lowest melt point is 67.06 ℃, the most stable configuration, the stick crystallization shape which is different from methyl-nitroguanidine and hydrazine nitrate appear at mol ratio of 32, and the structure is uniformity compared with other mol ratio eutectics. Calculation results of quantum chemistry show that the eutectic is not a simply mechanical mixtures, but to be formed by some sort of loose molecular or atomic interaction which can agree well with the result of enthalpy of fusion. 