Abstract: Up to now,hydrocarbon-bearing system fully formed from Mesozoic has not been found in China offshore oil and gas exploration.Chaoshan depression is a residual depression in Mesozoic group,with shallow buried depth.In view of revealing the accumulation characteristics and favorable exploration zones of Chaoshan depression,starting from the basic petroleum geological conditions,such as hydrocarbon source rocks,reservoir-seal assemblage,fracture characteristics,tectonic characteristics,and etc.,drilling failure reasons have been analyzed,and hydrocarbon accumulation regularities and reservoir forming models have been summarized.By comparison with accumulation conditions,the central uplift belt has been pointed as the favorable exploration zone.Meantime,reservoir-forming risks have been analyzed,and it provides suggestions for the next step work.