With the differences of 3D study fields, the ways to describespatial entities are different. It is difficult to design a single data model that is suitable for different 3D application cases. We should design a special 3D spatial data model based on the distributing features of spatial entities in the study fields. In this paper, analyzing the traditional 3D data models and taking the three-dimensional spatial phenomena in geological exploration engineering as the research background, we propose an object-oriented 3D blended data model with integrated vector and raster. This model is suitable for geological exploration engineering. By using logic relationship of the complex objects, bodies, surface, line and point objects to create topologic relationship among the objects. Some spatial entities data structures have been designed and their description were given with the help of an example of a volcano type iron field.%3维现象随着研究领域的不同，描述空间实体的方法存在较大差异，不可能设计一种数据模型来适合所有的应用领域，应根据研究领域空间实体分布特征，设计出专用的3维空间数据模型。本文对传统的3维数据模型进行了分析，以地质勘探工程的各种3维空间对象为研究背景，提出了适合地质勘探工程的矢量与栅格集成的面向对象混合数据模型，以复杂体—体—面—线—点对象之间的逻辑关系来建立对象之间的拓扑关系，设计了部分对象的数据结构，并以一玢岩型铁矿床为例，对数据结构进行了描述。
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