This paper uses a system of different research methods to evaluate the reserves of marine sand formations in Quang Nam region, and at the same time determine the reasonable mixing ratio between marine sand and other local materials to create a suitable fine aggregate for concrete for concrete used for coastal roads of coastal roads. Research results have identified 3 marine sand formations: dark-yellow sand of Da Nang formation (mQ13dn), white sand of Nam O formation (mQ22no) and light-yellow sand (m, mvQ23), with total resource reserves is 25696 million m3. In which, Nam O fine sand has a wide distribution area, large reserves, favorable exploitation conditions and has the greatest potential (mining resources up to 8017 million m3). That can be exploited and used as fine aggregate for concrete producing. In addition, this study has also determined 3 mixing ratios among fine sand, river sand and fine crushed stone as 50:20:30; 30:30:40; 40:20:40; to create a suitable mix of fine aggregate for manufacturing concrete.