Based on the mechanistic studies and literatures, 28a, 28b a plausible reaction mechanism was proposed as shown in Scheme 4. Firstly, the excitation of the photocatalyst TBADT by violet LED light produces the excited *[W10O32] 4-. Subsequent abstraction of hydrogen from an unactivated C-H bond in alkane 1 by the excited *[W10O32] 4-delivers alkyl radical species Int-1 and reduced decatungstate [W10O32] 5-. Cr(III) was readily reduced by [W10O32] 5-to generate Cr(II), which was then combined with alkyl radical Int-1 to forge alkyl-Cr(III) species Int-2. Finally, the addition of alkyl chromium reagent Int-2 onto αtrifluoromethyl alkene 2 followed by β-fluoride elimination arrived at the desired difluoroalkene 3. To conclude, we have described a visible-light-induced TBADT/Cr co-catalyzed gem-difluoroallylation reaction of unactivated alkanes. Diverse primary, secondary, and tertiary C-H bonds in both cyclic and linear alkanes are readily modified under mild conditions and with broad functionality tolerance. Mechanistic studies imply the involvement of a radical reaction pathway and the favorable reduction of CrCl3 to CrCl2 by reduced decatungstate W10O32 5-to close the catalytic cycle. Further investigation on the applications of this reaction is still underway in our lab.