With the “Digital Earth”, digitalization of petrochemical companies has been in the agenda. By classifying storage tank, liquid storage tank was chosen as research object for modeling. Based on analyzing elements modeling of tank, the three-dimensional data model was presented, and its basic data structure of modeling elements was defined by C++. According to above data model and data structure, at first, liquid storage tank could be subdivided into the bottom surface, profile, and top surface which was easy to modeling; then, the paper discussed the three-dimensional modeling methods and steps of above subdivisions in detail; finally, the spatial entity of liquid storage tank was established by integrating the subdivisions. VC++ is as programming language, OpenGL graphics package is as tool of visualization, and the three-dimensional modeling experiment system of liquid storage tank has been developed. Take test tank modeling for example, it is shown that three-dimensional data model, data structure and methods mentioned is feasible.
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