本文对长江河口区的重矿物借用实视显微镜与偏光显微镜进行鉴定和研究。已鉴定出的重矿物共二十三种之多,它们均以磁铁矿、角闪石、绿帘石、云母、石榴石、锆石、榍石、磷灰石等为主。综合重矿物种种特征,将它们划分为五个组合。在水动力条件控制下,同种或不同种矿物亦就产生相应分异作用,从而组成不同的重矿物组合,并展布于对应的沉积区上,可见重矿物组合与沉积区有相应的关系。为此可据重矿物组合所含矿物的比重、形状、大小、重矿物丰度等特征来推断它们沉积时的水动力条件。 In this paper, the heavy minerals in the estuary area of ​​Changjiang River are identified and studied by real-world microscope and polarized light microscope. Twenty-three kinds of heavy minerals have been identified. They are mainly magnetite, amphibole, epidote, mica, garnet, zircon, limestone and apatite. According to the characteristics of heavy minerals, they are divided into five groups. Under the hydrodynamic conditions, the same or different kinds of minerals also produce the corresponding differentiation, thus forming different heavy mineral assemblages and spreading on the corresponding sedimentary areas, showing that the heavy mineral assemblages have a corresponding relationship with the sedimentary areas . For this purpose, the hydrodynamic conditions at the time of their deposition can be inferred based on the characteristics of the minerals contained in the heavy mineral assemblage, such as their specific gravity, shape, size and heavy mineral abundance.