Abstract: With the developments of computers and communications, the multimedia coding comes into a new era. The MPEG 4 standard indicates the mature of the second generation coding technologies, such as object based coding and model based coding. In the paper here, all video objects and their characters, scene description, and profile/level in MPEG 4 are introduced. With the demands of the new standard, many non normalization tools and relevant technologies are provided for the MPEG 4 implementation. In the following content, some key technologies, such as image and video segmentation, panorama generation, facial detection and tracking, 2D mesh generation and tracking, and analysis and synthesis of 3D facial model, are also discussed.