We present a straightforward physical approach for synthesizing multiwalled carbon nanotubes(CNTs)-Pd Au/Pt trimetallic nanoparticles(NPs), which allows predesign and control of the metal compositional ratio by simply adjusting the sputtering targets and conditions. The small-sized CNTs-Pd Au/Pt NPs(~3 nm, Pd/Au/Pt ratio of 3:1:2) act as nanocatalysts for the methanol oxidationreaction(MOR), showing excellent performance with electrocatalytic peak current of 4.4 A mg~(-1) Pt and high stability over 7000 s. The electrocatalytic activity and stability of the Pd Au/Pt trimetallic NPs are much superior to those of the corresponding Pd/Pt and Au/Pt bimetallic NPs,as well as a commercial Pt/C catalyst. Systematic investigation of the microscopic, crystalline, and electronic structure of the Pd Au/Pt NPs reveals alloying and charge redistribution in the Pd Au/Pt NPs, which are responsible for the promotion of the electrocatalytic performance. We present a straightforward physical approach for synthesizing multiwalled carbon nanotubes (CNTs) -Pd Au / Pt trimetallic nanoparticles (NPs), which allows predesign and control of the metal compositional ratio by simply adjusting the sputtering targets and conditions. The small-sized CNTs- Pd Au / Pt NPs (~ 3 nm, Pd / Au / Pt ratio of 3: 1: 2) act as nanocatalysts for the methanol oxidation reaction (MOR), showing excellent performance with electrocatalytic peak current of 4.4 A mg -1 Pt and high stability over 7000 s. The electrocatalytic activity and stability of the Pd Au / Pt trimetallic NPs are much higher to those of the corresponding Pd / Pt and Au / Pt bimetallic NPs, as well as a commercial Pt / C catalyst. investigation of the microscopic, crystalline, and electronic structure of the Pd Au / Pt NPs reveals alloying and charge redistribution in the Pd Au / Pt NPs, which are responsible for the promotion of the electrocatalytic performance.