A valve system for driving fluid, applied to a microfluidic chip, comprising: a fluid unit far away from a rotation center; a fluid unit close to the rotation center; a fluid transferring unit; and a gas path pipeline for communicating the fluid unit close to the rotation center with the fluid unit far away from the rotation center; and wherein, a rotation radius of a fluid outlet of the fluid unit far away from the rotation center is greater than a rotation radius of a fluid inlet of the fluid unit close to the rotation center, the fluid outlet of the fluid unit far away from the rotation center is located at an end, away from the rotation center, of the fluid unit far away from the rotation center, and the fluid inlet of the fluid unit close to the rotation center is located at an end, close to the rotation center, of the fluid unit close to the rotation center; the fluid transferring unit is a fluid pipeline, a fluid inlet end of the fluid pipeline is connected to the fluid outlet of the fluid unit far away from the rotation center and a fluid outlet end of the fluid pipeline is connected to the fluid inlet of the fluid unit close to the rotation center; said valve system characterized by a micro array structure which facilitates fluid transfer is provided on an inner wall of the fluid unit close to the rotation center and/or an inner wall of the fluid pipeline, a suction force of the fluid unit close to the rotation center and a suction force of the fluid pipeline are greater than a suction force of the fluid unit far away from the rotation center, and liquid in the fluid unit far away from the rotation center is transferred into the fluid unit close to the rotation center via the fluid pipeline under capillary action in a centrifugation stop state. a fluid unit far away from a rotation center; a fluid unit close to the rotation center; a fluid transferring unit; and a gas path pipeline for communicating the fluid unit close to the rotation center with the fluid unit far away from the rotation center; and wherein, a rotation radius of a fluid outlet of the fluid unit far away from the rotation center is greater than a rotation radius of a fluid inlet of the fluid unit close to the rotation center, the fluid outlet of the fluid unit far away from the rotation center is located at an end, away from the rotation center, of the fluid unit far away from the rotation center, and the fluid inlet of the fluid unit close to the rotation center is located at an end, close to the rotation center, of the fluid unit close to the rotation center; the fluid transferring unit is a fluid pipeline, a fluid inlet end of the fluid pipeline is connected to the fluid outlet of the fluid unit far away from the rotation center and a fluid outlet end of the fluid pipeline is connected to the fluid inlet of the fluid unit close to the rotation center; said valve system characterized by a micro array structure which facilitates fluid transfer is provided on an inner wall of the fluid unit close to the rotation center and/or an inner wall of the fluid pipeline, a suction force of the fluid unit close to the rotation center and a suction force of the fluid pipeline are greater than a suction force of the fluid unit far away from the rotation center, and liquid in the fluid unit far away from the rotation center is transferred into the fluid unit close to the rotation center via the fluid pipeline under capillary action in a centrifugation stop state.