Abstract: Petrostratigraphically, the Quaternary rocks in the drilling hole SK03 in Luzhi area of Suzhou, Jiangsu Province include Pleistocene Haimen formation, Qidong formation, Kunshan formation and Gehu formation and Holocene Rudong formation. The Quaternary strata are divided according to the 10 assemblages of heavy minerals. The geological significance for the types of the heavy mineral assemblages is discussed. It is the foundation of stratigrapbic division, and also significant to guide the analysis on paleoclimate and sedimentary environment.