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In this paper, different CDPF samples were prepared on the CDPF catalyst by doping with 10, 20 and 30 g/L of different concentrations of La2O3additives. Using XRD, XPS, H2-TPR and other characterization methods and activity evaluation techniques, the relationship between the physicochemical characteristics and catalytic activity of the CDPF carrier surface catalyst doped with different concentrations of La2O3was studied. The results show that as the La2O3 doping concentration increases, the crystallinity of the sample first increases and then decreases; the Pt atomic concentration on the surface of the sample first decreases and then increases; the oxidation activity of the sample to CO shows a downward trend; The characteristic temperature T10 and T50 of the samples for C3H8 both increased first and then decreased, and then increased again; the T10 of the samples for NO2generation rate showed an increasing tendency.