N-S(Navier-Stokes) equations with SST turbulence model applied to to investigate the impact of counter-flow jet technology to supersonic blunt body for drag and heat reduction. At first, the numerical method applied in the paper is verified to be reliable, and on the premise, the affect of drag and heat reduction to the blunt body is numerically simulated and analyzed in detail based on change of jet mass flow and jet nozzle. The simulated result displays that there exist three flow modes in the mixing flow field. One is long penetration mode; the second is oscillation mode; the last is short penetration mode. The drag and heat on the blunt body with counter-flow jet is reduced through increasing mass flow and the same effect can also reach through enlarging the jet exit size. The results may be useful to some relative engineering application.