Research on appraising indicator system of economic security for the coal cities

Economic security has been a serious problem which threatens and hampers the sustainable growth of the economy. The paper sets up appraising indicator system of economic security on the basis of PSR model, and researches economic security for 21 coal cities by using BP artificial neural net. As innovation of researching economic security, BP artificial neural net has the better ability in level identification, and has application in researching economic security of cities. The conclusion was drawn that the economic security level identification of coal cities was low, and economic security level showed a more regional characteristic.