Abstract: The authors introduce the method of 3D MAX software to model the ore body, note the construction of the geological curved surface, as well as the principle and process with the 3D MAX software. Taking I-II copper-gold veins in northern field of Xiaoxinancha copper-gold deposit as an example，authers discuss their shape characteristics and the depositing rules, with new method of the shape on the grade of content. Further more, the ore body is subdivided into ore cakes and the 3D model of the copper and gold ore bodies in north field are founded. Such conclusions have been drawn as followings：(1) The method of 3D MAX software proves to be very simple and easy and available for mine management, design and production.(2)The proposed concept of the shape on the grade of content is advantageous to describe well the ore body, the shape and the distribution rule in the space. It also gives one new research mentality along with the invariable factors, such as the time ,the price, and so on.(3) New understand about the law of partial concentration have been got. Its use is expanded from the plane territory to the spatial scope, as to forecast the concealed ore body freely.

Key words: 3D MAX software, three dimension spatial shape, Xiaoxinancha copper-gold deposit, the shape on the grade of content