This paper introduces a rapid modeling method of 3D geological model for subway construction, which is convenient for construction companies in engineering of urban rail transit projects. By using the software platform of AECOsim Building Designer, a 3D geological model is finally established based on the map of geological cross section, through inserting control points, fitting geological interfaces and linking geological attributes. The modeling progress is easy, and the data are all of daily use for the construction companies, to satisfy the everyday application in construction engineering. The visualization of 3D geography and results of data query are able to create more real and intuitive understanding on various geological structures for the site technicians and managers, as well as to assist in solving different geological construction problems.

BIM gives rise to the second revolution for the construction industry. And now it is widely used and well developed in the domestic Construction Industry. According with the trend, the CAD software developers get involved into BIM one after another. To meet the market's needs, PKPM releases BIM-based construction drawing software, named PAAD. It provides a solution which will favor cross-platform collative design and promote the designer efficiency.

This paper presents four steps of the BIM model component library construction of design enterprise:1. component resource programming. 2. component classifying and coding. 3. component production, audit and storage. 4. component library management and maintenance. We elaborate one enterprise's BIM model component library's construction as an empirical case.

It is true that the widely using of plane-method construction drawing has largely improved the productivity of construction industry. With BIM maturing and expanding in china, 3D design and visualization have been the inevitable trend. The new technology based on BIM has changed the traditional design model. The dependence between mark symbols and dates in the plane method disagree with building's representation and collative design. To make it more suitable to the BIM's development, an improvement called informatization which link the information represented by mark symbols with graphic entities and embed them into BIM model needs to be introduced into current plane method. To achieve this goal, the China BIM Standards also should be modified.