Hannuoba basalts consisted of tholeiite and alkali-basalt series. The latter contain Iarge amount of type I and minor type II inclusions, and augite and anorthoclase megacryst, which in the extrusive basalts display the characteristics of gravitational and flowage differentiation. The results evaluated from different geothermometers and geobarmeters indicate that the pressures in formation of type I inclusion range from 1.4- 3.1GPa, augite megacryst-2 .i-3.1GPa, basanite 4 magma-3 .1GPa, alk-Ol-basalt magma-2.7GPa, Ol-tholeiitic magma-1.05GPa and Q.-tholeiitic magma-0.45GPa. The fo2 in formation of alk-basaltic magma series vas higher (about 1.1× 10-4-3.8×10-5 atm) than that of tholeiite magma series (about 1.8×10-6-1.6 ×10-7 atm).