Faulting and magma activities frequently occurred in Eastern China since Jurassic Period. This create favourable conditions for discharge of mantle-origin gas. Springs and volcanic lakes after Quaternary volcanic period in Wudalianchi volcanic area, Heilongjiang Province and Tianchi, Changbai Mountain, Jilin province, contain a large amount of CO2. CO2 content amounts to 77.80%-99.45%, and ~13Cco 2 value is --3.83 to --7.50, and 3He/aHe of gas seeps is (1.67 _+ 0.07) x 10-6~8.24 x l0 -6, namely R/ Ra is 1.19~5.89. According to gas flux statistics of 3 m 2 water area of Keyan Spring in Wudalianchi volcanic area, 279.3 m 3 gas is discharged daily. Volcanic rock and deep faults are generally distributed in juncture of Jiangxi Province, Guangdong Province. There are many gas seeps in hot spring in Zhegulong, Pingyuan, Guangdong Province and Xunwu, Jiangxi Province. Their CO2 content varies from 96.7% to 99.96%, and ~13Cco ~ value is --3.39 to --5.62%o, 3He/4He of gas seeps is (1.90--+0.06) x 10 -6 ~(3.09--+0.09) • l0 -6, namely R/Ra is 1.36-3.21. The above 813Cco2 is -3.39 to -7.50%o, which shows that CO2 is of mantle-origin; the R/Ra of 1.19~5.89 shows that helium gas contains a large amount of mantle-origined 3He. This shows that the discharge of mantle-origin CO2 and helium is widespread in volcanic area and outcrop area of igneous rock in Eastern China. The discharge of mantle-origin gas is also widespread in rift petroliferous basin of Eastern China. 24 CO2 gas pools(fields) has been discovered in Songliao Basin, Bohai Bay Basin, Northern Jiangsu Basin and Sanshui Basin, and East China Sea Basin, Zhujiangkou Basin. CO2 content of these gas pools is 72.5 to 99.76%, and CO2 content of most CO2 gas pools is over 92%, with also hydrocarbon gases(Cl_4). ~13Cco 2 value of gas pools is -3.47~-5.90%0, which suggest that CO2 is derived from mantle. 3He/gHe is (2.80_+0.08)• -6 (6.94_+0.20)• -6, namely R/Ra is 2.00~4.96. This shows that helium gas contains a large amount of mantle 3He. 11-56% of helium is derived from mantle helium. But the light 813C1 of CO2 gas pools ( 2, also associated with traps close to deep faults and intrusive rocks. The magnitude of mantle-origin CO2 flux is quite large, for example, COz reserves of Huangqiao Gas Field in the North Jiangsu Basin is estimated up to 624 x 108m 3.