"Lonely Patient" is an interactive immersive- space dance light projection work. The closed environment and the strong light and shadow effect create an immersive space. By capturing the movement path of the human body through somatosensory equipment and transmitting the data to the computer, the actors collaborate with the visual images in the immersive space to create different emotional interpretations. This project uses abstract patterns, rhythmic lines, and staggered spatial transformation to show the audience the inner world of patients with different kinds of mental diseases.