An experimental study has been performed on the heat transfer characteristics of condensation by the injecting steam flow in the tube. The comparison between results of experimental data and available data concerning equivalent Reynolds number has studied. As the result, the followings were obtained. 1. The shear stress of the radial direction in the tube when the injecting steam flow was condensed can be written as root($ au$sub(0)/$ au$sub(0v))=1+1.46X sub(tt) super(0.20). 2. The effect of the heat transfer in the injecting steam flow was less than the value of equivalent Reynolds number. The reason are the nonuniform fluid film of the axial and radial direction in the tube. 3. The value of N sub(u) by the heat transfer of condensation can be written as N sub(u)=1.08$ imes$[{$ ho$ sub(l) d/$mu$ sub(l)}/{$delta$+(2.5/P sub(rl)) ln(y sub(i)/$delta$)}]$ imes${$ au$ sub(0)/ $ ho$ sub(l)} super(1/2).