Carbon nanotubes (CNTs) supported platinum electrocatalyst Pt/CNTs with high dispersion were prepared by a modified ethylene glycol method with sodium dodecyl sulfate (SDS) as the stabilizer.UV-Vis,FTIR and XRD spectroscopic analysis methods were used to study the preparation of the electrocatalysts,and the effect of the SDS addition to the ethylene glycol solution on the structure as well as the electrocatalytic activity of the Pt/CNTs electrocatalysts were also investigated.The results showed that PtCl2-6 could form a complex compound with SDS,and all PtCl2-6 were completely reduced by ethylene glycol;oxygen containing groups were produced on the surface of CNTs to facilitate the Pt nanoparticle absorption,and no SDS remained on the electrocatalysts;the Pt/CNTs electrocatalysts exhibited face-centered cubic structure;the particle size of Pt/CNTs-2 catalyst prepared by SDS addition was about 4.5 nm.The CV test results showed that the Pt/CNTs-2 catalyst showed higher methanol electro-oxidation activity compared with Pt/CNTs^-1 prepared by traditional ethylene glycol reduction method.