///The dolomite associated with hydrothermal solution is characterized by coarse crystallization and can form reservoirs with high porosity and permeability. A study of fluid inclusions shows that the medium-coarse crystalline dolomite has a fluid inclusion homogenization temperature of 173～199℃ corrected by pressure. The powder-fine crystalline dolomite has a δ¹³C_PDB of -2.45‰～-1.08‰, -1.54‰ on average; its δ¹⁸OPDB is-6.90‰～-3.54‰, -5.35‰ on average; the medium-coarse crystalline dolomite has a δ¹³C_PDB of 2.76‰～-1.12‰, -1.73‰ on average, which mostly overlap those from the powder-fine crystalline dolomite and is a little bit lower than the latter. Its δ¹⁸O_PDB is -10.91‰～-5.18‰, -7.44‰ on average, obviously lower than those from the powder-fine crystalline dolomite with partial overlap.