TrailBlazer is a diffusion-based video generation model that enables customized video creation through trajectory control. Users can guide the subject in a video using simple bounding boxes without requiring additional model training or online optimization. TrailBlazer supports the editing of spatial and temporal attention maps, as well as controlling the trajectory and appearance of the subject through keyframe bounding boxes and prompts. This model is simple and efficient to operate, generating natural and smooth video effects. TrailBlazer is suitable for a variety of user scenarios, providing an unlimited creative experience for video generation.