Because of the large-scale integration of wind power, the dynamic characteristics of power system have many uncertain effects. Based on deterministic analysis methods, traditional on-line security assessment system cannot quantitatively estimate the actual operating conditions of the power system for only considering the most serious and credible accidents. Therefore, the risk theory is introduced into an on-line security assessment system and then an on-line risk assessment dynamic security assessment system system for wind power is designed Based on multiple data integration, and implemented by combining with the the wind power disturbance probability is available and the security assessment of the power grid can obtain security indices in different aspects. The operating risk index is an expectation of severity, computed by summing up all the products of the result probability and its severity. Analysis results are reported to the dispatchers in on-line environment, while the comprehensive weak links are automatically provided to the power dispatching center. The risk assessment system in operation can verify the reasonableness of the system.