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oss-section ratios σTI/σSC of transfer ionization (TI) to single capture (SC) of Cq+- and Oq+- He (q=1-3) collisions in the energy range of 15-440keV/u (0.8-4.2V,Bohr) are experimentally determined. It is shown that σTI/σSC strongly depends on the projectile velocity, and there is a maximum for E (keV/u) /q1/2≈150. Combining the Bohr-Lindhard model and the statistical model, a theoretical estimate is presented, in reasonable agreement with the experimental data when E (keV/u)/q1/2 35.