The U.N.Security Council authorized the Multinational Protection Force in Albania (MPF) to deploy on the territory of Albania and to help create a secure environment for the humanitarian assistance by its resolution 1101 (1 997) in March 1997. The MPF is a multinational force under the Chapter VII of the U.N. Charter， and has some aspects of U.N. peace-keeping operations as well. Created with the consent of the government of Albania， under a qualified Chapter VII resolution， the MPF deployed on its and performed its objectives; to facilitate the safe and prompt delivery of humanitarian assistance， and to help create a secure environment for the missions of international organizations. Such terms had previously been tried by the robust peace-keeping forces and finally had been failed， for example in Somalia as well as in Bosnia-Herzegovina. The establishment of a multinational force with the nature of a peace-keeping operation was devised to deal effectively with new situations ， in which the confusion and the disorder would overwhelmed and might not be managed by the robust peace-keeping forces. The MPF is among such multinational forces. This paper aims to clarify the legal structure and characters of the MPF， and to consider its implication in the U.N. peace operations in 90's.