Giving consideration to the bidirectional uncertainty of wind power output and load, in order to improve the accuracy of reactive power optimization of asset allocation, the paper combines the wind power output scenario with complete-bus load clustering method in distribution network, and establishes the selection model of system operation scenario. This method can accurately select the system operation status, comprehensively consider the randomness of load and wind power output, and effectively configure reactive power compensation capacitor for distribution network containing wind power generators. The validity of the method is verified by IEEE 33 bus distribution system.