Software estimation is an important activity in software project management. Many software projects fail because of the inaccurate and untimely estimation of cost. Estimation in the early stages of the software life cycle became important though it helps to prevent or reduce project failures. Early estimation became so important while bidding on a project or signing the contract between the client and the developer. The early software estimation is carried out at a point when the details of the problem are not revealed completely. Now a days most of the software industries are focusing on Object-Oriented Software Development. Though the Use Case diagram is prepared after preparing a clear requirement specification, when all the artifacts about the system was clear enough, the UML Use Case Point method can be useful for early estimation. Many researchers and practitioners have done remarkable researches on Use Case Point Method and revealed several artifacts of use case in order to extend the well-known UCP method to support various range of software estimation. In our study, we have surveyed several papers on use case point method and highlighted the proposed metrics or factor by the researchers through this report.