Abstract: Cloud computing is a kind of super computing model on the Internet. The development of cloud computing brings some challenges to evidence collection. Under cloud computing environment, the evidence collection includes three stages:detection,fixup and scavenge. There are some safe risks in cloud computing, so collecting evidence under cloud computing environment will face some technologic and legal problems. As to the problems on evidence information and collecting measure, we can solve them by the technology of data migration and Intrusion Detection System. As to the 1e- gal problems,we can solve them by improving the legislation and strengthening the international cooperation.

Key words: Cloud computing, Collecting evidence, Data migration, Virtualization