An injunction - an order that an act be done or not be done -is considered an extraordinary remedy and is enforceable by the power of contempt. Injunctive relief may be granted on a provisional basis at a preliminary stage of the proceedings in the form of a temporary restraining order or a preliminary injunction depending on the time of issuance and duration. A preliminary injunction is issued after hearing on noticed motion. Its purpose is, at least theoretically and usually in fact, to preserve the status quo and prevent irreparable harm pending trial on the merits. The purpose of this article is twofold. First, this article is intended to introduce the factors considered in granting preliminary injunctions in the U.S. judiciary, especially with respect to those in corporation and intellectual property litigation. Second, it focuses on presenting experimental ideas that we should consider the possibility of adopting the law of a preliminary injunction to Korean civil procedure, although it was first granted and developed in English courts.