Abstract: Reef-flat body is the dominant reservoir type in the Middle-Upper Jurassic Callovian-Oxfordian carbonate rocks in Amu-Darya basin. Based on seismic facies analysis, rock thin section identification and reservoir physical property test in Amu-Darya right bank, and combined with paleogeomorphology and stratigraphic correlation, the article demonstrates the types of reef-flat bodies in Callovian-Oxfordian carbonate rocks in Amu-Darya basin, and analyzes the genesis of the reef-flat reservoirs. 2 types of reef-flat bodies such as platform-margin reef-flat body and gentle-slope reef-flat body are found in Callovian-Oxfordian strata in Amu-Darya basin. The development of the reef-flat bodies is controlled by paleogeomorphology and sedimentary environment is the main controlling factor of the development of the reef-flat reservoirs. Selective dissolution of biological components is the reason causing the differences of the 2 types of reef-flat reservoirs. All the characteristics of developed primary framework pores and intergranular pores in the platform-margin reef-flat body, high cotent of the easily dissolved components of reef-building organism and bioclastics, and easy to form diagenetic fluid infiltration and disolved pores indicate that the physical properties of the reservoirs are pretty good and the high positions of the paleogeomorphology are the favorable zones for reef-flat reservoir development