FlowVid is an optical flow guided video synthesis model. By utilizing the spatial and temporal information of optical flow, it achieves temporal consistency between video frames. It seamlessly integrates with existing image synthesis models to enable various modification operations, including stylization, object swapping, and local editing. FlowVid boasts fast generation speed; a 4-second, 30FPS, 512×512 resolution video can be generated in just 1.5 minutes, outperforming CoDeF (3.1x), Rerender (7.2x), and TokenFlow (10.5x) respectively. In user evaluations, FlowVid achieved a quality score of 45.7%, significantly surpassing CoDeF (3.5%), Rerender (10.2%), and TokenFlow (40.4%).