GAGAvatar is a Gaussian model-based technology for 3D avatar reconstruction and animation generation. It quickly generates 3D avatars from a single image and supports real-time facial expression animation. The main advantages of this technology include high-fidelity 3D model generation, fast rendering speed, and the ability to generalize to unseen identities. GAGAvatar captures identity and facial details through an innovative dual-improvement method and utilizes global image features and 3D deformable models to control expressions, providing a new benchmark for research and applications in digital avatars.