Crystallization behavior of RDX in different solvents was investigated,and cyclohexanone was founded to contribute the highest crystal quality. An in-depth study involved the cooling crystallization of RDX from cyclohexanone was conducted. Results show that stirring speed affects the particle size and its distribution mainly,while the cooling rate determines the number and size of internal defects,when the stirring speed is in 200-400 rpm and the cooling rate in 0.05-0.2 K·min^-1,the characteristic drop height of RDX can increase by 70%.