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MgB2 tape samples with simultaneous additions of acetone and La2Os were prepared by an in-situ processed powder-in-tube method.Compared to the pure and single doped tapes,both transport Jc and fluxing pinning are greatly improved by acetone and La2O3 codoping.Acetone supplies carbon into the MgB2 crystal lattice and increases the upper critical field,while the La2O3 reacts with B to form LaB6 nanoparticles as effective flux pining centers.The improvement of the superconducting properties in codoped tapes can be attributed to the combined effects of improvement in He2 and flux pinning.