International oil price has dropped sharply this year, which has drawn attention from various parties. ANBOUND research team believes that the downward trend of oil price will last for a long time. On one hand, since oil exporting countries have different financial restrictions and the influences of output restriction on different countries vary wildly, it is hard to reach a consensus on output restriction. On the other hand, the influences of American shale oil revolution haven't been fully understood, especially the impact on world energy pattern has begun to show. This is also the reason why OPEC chooses seizing American market share instead of Output Restriction and Price Maintenance.