In China, petroleum is the very core of the subject on the energy security With the argument of the external dependence degree of petroleum accommodation, the problem of petroleum security becomes more and more prominent It will be an important problem of the sustainable development of economy and society in the 21st century in China China is a country which is richin marine oil and gas resources There are nearly 100×10⁴ km² oil bearing sedimentary basins, 240×10⁸t offshore oil resources, 14 0×10¹²m³ natural gas resources, 12×10⁸t geological reserves of oil and 2350×10⁸m³ natural gas in the vast maritime space The exploition and utilization of marine oil and gas resources can partly solve the quantity of import on oil and gas resources This article discusses some patterns of security such as self supported security,exoteric security,substitute security and developing abroad pattern and so on And the connotation and conditions of developing abroad pattern are discussed particularly The international and domestic conditions on petroleum security and natural gas security are analyzed At the same time, the tactic countermeasures on how to solve the problem of oil and natural gas are put forward:(1)to quicken the prospection of oil and gas resources of land and sea, increase geologic reserves and proven exploitable reserves of oil and gas;(2)to establish national petrolic tactic repertory and the repertory bases quickly; (3)to improve international environment of the neighbouring countries and import oil and gas resources from abroad which serve as a channel for developing multiple import in the future;(4)to raise the position of natural gas in the structure of energy resources, the ratio of replacing petroleum with gas is added;and (5)to quicken the pace of constructing imported crude oil transportation guarantee syetem import petroleum