The main construction of the Longxikou Navigation-power Junction in the Minjiang River is characterized by a tight construction period,large concrete consumption,high construction intensity,and strict temperature control requirements.The natural sand in the Minjiang River Basin has a low fineness modulus,which reaches the superfine sand standard.We study the screening system design to check the design production capacity of this system.Meanwhile,we set a three-level crushing process and design the precise blending of natural sand and machine-made sand.The environmental protection packaging is adopted in the overall system,which comprehensively reflects the progressiveness of the system design from multiple angles.Finally,the results can provide a reference for similar projects.