The magnitude and spatial distribution of potential Black Sea methane hydrate reservoirs has been estimated. The calculations show that average water depth from which methane hydrate starts to forms in the Black Sea runs from 620 to 700 m,embracing a prone area of 288 100 km+2,ie, 91% of the deep Black Sea basin,The average thickness of the MHSZ is 303 m with a bulk of sediment running from 85 310 to 100 280 km³,The evaluations show the hydrate contents of 77～90 to 350×10⁹ m³,ie, about 10 to 50×10¹² m³ of gas methane are trapped within the Black Sea sediments in the form of hydrate.