The pump is in charge of sending the materials mixture into cyclone, then the centrifugal grading fine sand is provided to vibrating screen through underflow exit. After sieve dehydration, there is effective separation of fine sand and water. Small part of sand and mud is recycled into water trough through returned tank. The water will remove impurities from mixture by the water outlet. The fine sand recycle system can recycle 85% fine particles in discharge. The purpose of cleaning, dehydration, and classification can be achieved.