China possesses a broad sea area included twelve sedimentary basins such as Bohai and eastern part of China sea, cover about 770 thousand sq. km area. Oil and gas exploration was initiated in 1957, forty years later, accumulative proven reserve grew to 1086.636 million tons OOIP and 305.418 billion cubic meters in 1997, nineteen oilfields and two gas-fields have been developed with annual oil and gas production were 16.285 million tons and 4.05 billion cubic meters relatively. China ocean petroleum industry has gained a notable achievement as four large ocean oil bases such as Bohai, western and eastern part of south china sea construction, oil and gas production is equivalent to 23.29 million tons in 2001, account for about one sixth among the 150 million tons oil and gas production in China.