The burning spectra of Mg/Sr(NO3)2 and Mg/Ba(NO3)2 compositions are tested respectively to obtain the burning spectrum distribution maps with the whole-band radiometer for analyzing the distributions of burning spectrum. It can be concluded that the total radiant energy of 620~760 nm is 80.59% in Mg/Sr(NO3)2 composition burning spectrum through researching burning spectrum. And in Mg/Ba(NO3)2 composition burning spectrum, the total radiant energy of 500~578 nm is 21.15%, 578~592 nm is 3.30% and 620~760 nm is 60.41%. Combining the burning spectrum with the derivative spectrum is served as a means of identifying both types of compositions.