For comparative review of mediation contract for real estate transaction in Korea and cases of legislation in overseas were looked into and their implications reviewed. This study aims to present the following directions for legislation required for improvement of agency contract system and disclose the importance of contemporary significance of mediation contract for real estate transaction. The first is the unification of contract law. The second is documentation of mediation contract for real estate transaction. he third is segmentation of agency fee and responsibilities of the contract. The fourth is guaranteeing of justice and responsibilities of the contract. Real estate agency contract, as the contract in the preliminary stage, is very important contract in order for sound real estate transaction to be accomplished. Therefore, real estate agency and client for brokerage, who are the parties of the contract, must bear obligations and responsibilities appropriate for justice in contract in executing real estate agency contract.