The purely chemical combustion-driven HBr chemical laser has been studied using D2 as fuel and NF3 as oxidant. The pumping reaction is H+Br2→HBr(v≤6,J)+Br. Hydrogen and fluorine atoms are produced by the reaction of F+H2→HF+H and burning D2/NF3 mixtures, respectively. And a supersonic flow system provides conditions of low temperature, low pressure and fast flowing to satisfy the need of laser extraction. The stable laser output at P2(4)、P2(5)、P3(5) and P3(6) with the maximum output power of 14.3 W is obtained, when we extract energy from the stable cavity consisted of a totally reflection mirror and a partially reflection mirror (98%).