The invention relates to a hole-transporting blue color compound, which is a fluorine derivative based on 9, 9-bi-(4-(bi-p-methypheny) aminophenyl). The preparation method is to first mix 9, 9-bi-[4-(N, N-bi-p-toluidine) phenyl]-2-dibromofluorine and boric acid pinacol ester of conjugate radicle, or to mix 9, 9-bi-[4-(N, N-bi-p-tolyl-amino) phenyl] fluorine -2, 7-bi-boric acid pinacol ester and bromide of conjugate radicle; and then add in toluene, potash solution, aliquat336 and catalyst tetrakis (triphenylphosphine) palladium, and heat and reflow for 10 to 30 hours in nitrogen environment; when the reaction is done, decompress, remove the solution and get the target product, the derivative based on 9, 9-bi-(4-(bi-p-methypheny) aminophenyl) fluorine substituted by unilateral conjugate radical. The compound can be used as the hole-transporting layer and the luminescent layer as well in electroluminescent devices.