In this paper, a study was carried out to examine fly ash minut stone concrete and Portland cement ( concrete). The author reported that Ca ( OH)_2 、 C-S-H of the concrete and the appear character of concrete section by means of SEM. 用扫描电镜研究了粉煤灰细石混凝土和普通硅酸盐水泥制成的细石混凝土中的Ca(OH)2、C-S-H及混凝土断面的形貌特征。