To study rapid sintering by induction heating, we used high strength-alloyed steel powder, completely alloyed powder of 0.55 mass%Ni-0.6mass%Mo-0.2mass%Mn-0.5mass%C-bal.Fe. In this rapid sintering, evolution of a Martensitic or Bainitic structure in the matrix was examined to play a very important role. Thus, the substantial controlling factors were the holding time and cooling time for grain boundary diffusion. Experimental results showed that this process required a higher sintering temperature compared with the continuous furnace, but the sintered materials gained a higher radial crushing strength (R.C.S) by changing the holding time and cooling time. Although, the holding time were only 3-4minutes in the present process, and high strength-alloyed steel was also obtained to a very good size accuracy when putting it in practical use industrially. The optimum condition appeared to be a sintering temperature of 1573 K and holding time 120-180s with a heating time of 65s; the RCS data was attained about 1200 MPa.