［Abstract］ This paper introduces the core ideas of the information ecological theory,analyzes the report recently released by British House of Commons Culture,Media and Sport Committee named Cyber Security:Protection of Personal Data Online by information ecological theory framework including information man and information circumstance,elaborates the roles and ecological niches of the UK`s Information Commissioner`s Office,TalkTalk and its users,third-party partner agencies, and public safety agencies in the personal data protection ecosystem,summarizes it＇s experiences and practices in this theory frame;On this basis,the article analyzes the existing problems of online personal data protection ecosystems,such as ecological chain fragmentation and ecosystem imbalance;Then this work tries to find the possible cause of the problem,establishes personal data protection macro mechanism and proposes appropriate countermeasures．