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In order to intuitive and meticulous manage the hydropower station project construction, in view of the current commonly-used project management systems of the contract-oriented system and the schedule-oriented system, a spatial object-oriented project construction management concept is proposed. The definition of project construction spatial cellular management is given at first. Based on the definition, combined with the characteristics of hydropower station project management, in the construction measure control network of hydropower project, according to the contract of the project scope, a 3D object model is built with the measured data in construction process. Then the object was dispersed based on the quality check elements. Relationship can be built between the management attributes and the elements, which will facilitate the project management. At last, it is introduced that the spatial elements of the object-oriented hydropower station project construction management system from build engineering object, engineering object segmentation and object attributes management application step.