Friction sensitivity of high explosive was analyzed according to thermal explosion theory by theoretical analysis and numerical modeling. Melting of high explosive by friction between high explosive and metal was considered in the model. The change of friction force acting on high explosive due to melting was taken into account. Temperature increase on friction surface and ignition time of high explosive were determined by calculation. The pressure acting on HMX was 400 MPa and relative velocity was 3.8 m·s^－１ between high explosive and steel,the same as the friction sensitivity test for high explosives. As the temperature on friction surface reached 750 K,ignition of high explosive occured. Ignition time was 0.43 ms and slide distance between steel and high explosive was 1.6 mm. The slide distance is in agreement with experimental one quite well.