Computer graphics technology,(shorter form CG),after several decades of development and accumulation,has now revolutionized the film industry. Observational documentary has been rare, expressed as a subjective goal of the vast majority of documentaries, there is need to use CG technology in order to reach the director's concepts,not to mention difficult to making films like ancient,history,microscopic universe,etc.Analyze specific 2D and 3D images,animation, special effects, composing techniques, with examples to prove the rational use of CG technology documentary than a simple graphic literature, more intuitive and vivid, but also to stimulate more creative ideas.%计算机图形技术（Computer Graphics Technology，简称CG），历经几十年的发展和积累，如今已彻底改变了影视工业。冗长沉闷的观察型纪录片已不多见，以主观表述为目标的绝大多数纪录片，都存在需要运用CG技术才能达成导演构想的一些镜头，更何况是难以拍摄的远古、历史、微观、宇宙等题材。分析特定的二维和三维图像、动画、特效、合成技术，结合实例，证明了合理运用CG技术的纪录片比起单纯的图文文献资料，更加直观和生动，也能激发更多的创作思路。
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