This paper discusses different types of economic policy. In recent years of economic unrest since the Great Recession of 2008 and 2009 to the current global virus outbreak crisis of COVID-19 pandemic, the public and academia raised the long-debated question again: should, and to what extent government should intervene the market.The major focus of this paper is on the use of regulatory policy, monetary policy, fiscal policy, and their applications in real world, with examples that spanned different time periods of time. The first part of the paper we will first explain the tree policies that government or central bank usually uses, which include the introduction of the specific tools each type of policy would use and discuss its benefits and shortcomings. In the next part of this paper, we discussed the various type of policy responses made by the US government and Federal Reserve during the COVID-19 era to illustrate how these policies discussed in this paper could be implemented to help the economy. In the last part of paper, we made the conclusion on the topic: even though government intervention sometimes distorts the market, but we believe the various kinds of policies are necessary to restore the normality of economy under turmoil time.