Abstract:Nowadays,listed companies will use various means to gloss over the finacial statements in order to achieve their own interests. In this way,they will achieve the expected benefits and get away from evaluation of supervision. With perfect financial data ,they will attract increasing investors.Among the ways to regulate the profit, the most one is using accounting estimates. Accounting estimates are the most subjective and flexible factor for the accountants use them to regulate profits. As follow,I will start with the meaning of studying accounting estimates,then I will refer the facts that why these companies prefer to use accounting estimates to regulate profits and how they do it.At final,I will refer some useful advices to avoid those phonmenons.By writing it, it would help the authority make policy to regulate China’s capital market and the investors have a favorable investment environment.