In U.S., offshore drilling is a controversial topic due to its two-side effect, it had been banned since 1980s, but in 2010, the president Obama decided to Lifted restrictions and opened vast expanses of American coastlines to oil and natural gas drilling to reduce gas prices in U.S., whether it is necessary to allow the offshore drilling has become a troublesome problem. This paper will discuss the advantage and disadvantage of the offshore drilling. Offshore drilling refers to a mechanical process where a wellbore is drilled through the seabed. It is typically carried out in order to explore for and subsequently produce hydrocarbons which lie in rock formations beneath the seabed. Most commonly, the term is used to describe drilling activities on the continental shelf, though the term can also be applied to drilling in lakes, inshore waters and inland seas. Offshore drilling is much related to energy independence, which is an important goal for the United States. The purpose of energy independence is to reduce the U.S imports of oil and other foreign sources of energy. Energy independence is espoused by those who want to leave America unaffected by global energy supply disruptions, and to restrict a reliance upon politically unstable states for its energy purposes. Energy independence is highly concerned with oil, being perhaps the most important imported energy sources for purposes of both transportation and electricity. The United States is the world's third largest producer of oil, but it also relies on imported oil. More oil is imported from Canada than any other country. 19% of imported oil comes from the Middle East. Such resources are finite and decreasing, despite an increase in demand. World-wide demand for oil is projected to grow 60% over the next two decades. The U.S. currently produces about 40% of the oil that it consumes; its oil production peaked in 1970...