TFO and BFFO are impurities existing in the synthesization process of DNTF. The influence of TFO and BFFO on shock sensitivity of DNTF was studied by small scale gap test. The study shows that when adding 10% BFFO or TFO to DNTF explosive, the shock sensitivity of DNTF reduces, and the desensitization of DNTF with BFFO is more obvious than the desensitization of DNTF with TFO.