The effect of β stabilizing elements on the strengthening behavior of titanium α phase were investigated by selecting α' titanium alloy, though microhardness and microspecimen tensile test. Results show that the β stabilizing elements such as Mo, V, Cr and Fe present significantly higher strengthening ability than α stabilizing element Al. The hardness and strength of Ti-xMe α phase increase dramatically by addition of 6wt%Al. The strengthening ability of β stabilizing elements above keep invariant when 6wt%Al are added. The sequence of the strenghening ability of Mo, V, Cr and Fe are Fe>Cr>Mo>V. Adding of 6wt% Al into “Ti-xCr, Ti-xV”, “Ti-xMo, Ti-xV” and “Ti-xFe, Ti-xV”, the difference of strength between the two in each group decreases.