In this paper, a downside risk constrained optimal reactive power dispatch control (ORPDC) model is proposed, with the consideration of uncertain wind power integrated into power systems. In this model, the expectation of transmission loss and its downside risk are considered, simultaneously. In this way, the proposed model is formulated as a multi-objective optimization problem. Then we introduce a risk tolerance parameter for converting this problem into a single-optimization one, which can be solved by the algorithm of group search optimizer. Finally, the effectiveness of the proposed model is verified by simulation studies on a modified IEEE 14-bus power system.