In order to solve the problems of irregular crystal morphology and uneven particle size distribution of 1,1-diamino-2,2-dinitroethylene (FOX-7) obtained by direct synthesis. Solubility, supersolubility and cooling crystallization kinetics of FOX-7 in V(N,N-dimethylformamide)∶V(water)=7∶3 binary system were determined by laser dynamic method and intermittent dynamic method respectively.Results show that the solubility equation of FOX-7 in the above system is . There is a granularity-independent growth model during cooling crystallization.In the nucleation rate and growth rate equation, the supersaturation ratio S index are respectively 0.61 and 0.45, the suspension density M_T index is 2.30, and the stirring strength ω_r index is 0.22.