Based on the blast field test results of 1 kg thermobaric explosive, the method of grey correlation analysis was used to investigate the influence rule of 5 raw materials and their contents on blast performances. The results show that the reduced order of the positive correlative factors investigated to the overpressure at 3 m from the explosion center is: high explosive RDX, fine particles of ammonium perchlorate(AP); and with the overpressure at 9 m is: fine particles of aluminum powder Al(Ⅱ), coarse particles of aluminum powder Al(Ⅰ) and coarse particles of amonium perchlorate(AP). It indicates that high explosive RDX and fine particles of AP are in favor of the overpressure at 3 m, but weaken the overpressure at 9 m. Whereas the aluminum powder with two particles size and the coarse particles of AP have the inverse influence on overpressure at both distances.