Imagination is more important than knowledge, because knowledge is limited, and imagination summarizes everything in the world, promotes progress, and is the source of knowledge evolution. Strictly speaking, imagination is the key to scientific research. The practical factors of raising a problem are often more important than solving a problem, because solving a problem may be just a teaching or experimental skill. But raising new questions, new possibilities, and looking at old problems from a new perspective, Both require creative imagination and mark real progress in science. A soul without imagination is like an observatory without a telescope.