Delaware is well known as a corporate haven and worldwide famous for its corporate law. The Delaware Corporate Law and courts' decisions have offered board of directors a possibility for flexible management. Hence, a number of major corporations are incorporated in Delaware. First of all, this essay will describe the features of Delaware Corporate Law, in particular the fiduciary duty of the board of directors, business judgment rule and corporation opportunity. The takeover case law is developed with the takeover waves in Delaware. The board of directors of the target company is allowed to take defensive measures against the tender offer. Finally, this essay will explain the famous takeover cases to analyze the legal opinions of the Delaware courts and the development of the takeover law in Delaware.