本文研究了峨眉龙一新种,即天府峨眉龙(Omeisaurus tian-fuensis,sp nov.)。新种产于自贡大山铺中侏罗世沙溪庙组下部。标本保存相当完好,材料丰富,是峨眉龙属的重要补充。新材料的发现,进一步说明了峨眉龙属与马门溪龙属有相当密切的关系,本文主张将该两属同归于马门溪龙科中。 This article studies a new species of Emei dragon, Omeisaurus tian-fuensis (sp nov.). The new species was produced in the lower part of the Jurassic Shaximiao Formation in the Dashanpu, Zigong. The specimen is well preserved and the material is rich. It is an important addition to the genus Emei. The discovery of new materials further illustrates that there is a quite close relationship between Emeiosaurus and Mamenchisaurus, and this paper advocates that the two genera should be attributed to Mamenxiosaurus.