The thermal safety, friction sensitivity and impact sensitivity of the pyrotechnics with modified and unmodified potassium chlorate(KClO₃) were tested and compared. Results show that compared with unmodified KClO₃, initial exothermic temperature of pyrotechnics with modified KClO₃ increases by 36.08 ℃,and the time to maximum rate prolongs more than 6 times, and its maximal pressure produced by unit mass, adiabatic temperature, friction sensitivity, impact sensitivity decreases by 0.63 MPa·g^-1, 95.99 ℃, 64% and 72% respectively.