Mixed sand is completely used in the concrete of Longxikou Navigation-power Junction project in Minjiang River,and its quality is an important part of concrete quality control.The technical requirements of mixed sand in this project should take into account the requirements of water transportation and power industry specifications,and the quality control goal of mixed sand is qualified and stable quality.This paper discusses the practical problems in the use of mixed sand and the subtle differences between the two industry codes for mixed sand.The quality control of mixed sand focuses on the production management of natural sand and artificial sand,several quality control elements of natural sand and artificial sand production in this project are proposed to control the quality of mixed sand.The concrete quality of the project is guaranteed and the practical application effect is good.