The invention provides a method for evaluating an aircraft state based on a broadcast type automatic correlative monitoring data and a system thereof, wherein the method comprises the following steps of: building an universal state equation according to a relationship among state equations of a plurality of flight modes; confirming a mode switching protocol according to a relationship among the different flight modes; judging the current flight mode according to the broadcast type automatic correlative monitoring data, historic information, a flight plane and the mode switching protocol; and evaluating the current motion state according to the universal state equation and the current flight mode. The system comprises an equation building module, a protocol confirming module, a mode judging module and a stare evaluating module. The invention effectively evaluates the flight mode of the aircraft and improves the accuracy for predicting a flight path.