An expression for premixed turbulent flame speed is presented, in which Reynolds numberRλbased on turbulent microlength scale λ and turbulent intensityú, and Damkohler number Da defined as the ratio of characteristic residence time of turbulent flame to that of laminar flame, are considered to be the two controlling parameters. The constants involved in that expression are detennined by regression with the available experimental data. It is found that the ratio of turbulent flame speed to laminar flame speed (Vs/Vl) increases withRλlinearly only when Da is kept fixed.