In order to study the properties of 5, 7-diamino -4, 6-dinitrobenzenfuroxan(CL-14), CL-14 was refined via recrystallization of potassium salt of CL-14, acidification at high temperature and acid elimination under heating. The sensitivity and thermal stability of unrefined CL-14 and refined CL-14 were tested by the standardization method GJB772A-1997. The peak temperature of exothermic decomposition reaction of unrefined CL-14 and refined CL-14 was determined by DSC. Results show that the pH of refined CL-14 is 6.5. The impact sensitivity and friction sensitivity are 24% and 16% respectively. The amount of gas evolved of refined CL-14 obtained by Vacuum Stability Test with 200 ℃/48 h is 0.81 mL·g^-1.The peak temperature of exothermic decomposition reaction of refined CL-14 is 313.7 ℃, 13.7 ℃ higher than that of the unrefined CL-14, showing that the refined CL-14 has lower acidity and better thermal stability.