Nongovernmental Finance as a kind of informal financial forms has made outstanding contributions to the economic development of China, but due to lack of special laws and regulations on Nongovernmental Finance supervision, which makes Nongovernmental Finance produce huge risk and affects the safety and stability of financial market.In 2011, with the outbreak of Wenzhou Nongovernmental Finance crisis, the problem of supervision over Nongovernmental Finance causes a social attention once again. To perfect legal supervision over Nongovernmental Finance should follow the appropriate intervention principle, the economic security principle, the balance coordination principle; take measures such as giving Nongovernmental Finance legal status, establishing and improving the market access and withdrawal mechanisms, using classification of supervision to Nongovernmental Finance.