The invention provides a realization system and a method for airspace running simulation airflow engine. The realization system comprises a flight flow distribution feature analysis module, a flight flow statistics module, a flight flow factor modeling module and a simulation solution flight flow module, wherein, the flight flow distribution feature analysis module is used for determining the factor information of the flight flow, analyzing the distribution feature of each factor and determining the corresponding data probability model; the flight flow statistics module is used for accountingvalue of each factor in the current flight schedule according to the flight flow factor data probability model provided by the flight flow distribution feature analysis module, and determining the distribution parameters; the flight flow factor modeling module is used for respectively building the probability distribution model of each factor in the current flight schedule according to the data provided by the flight flow statistics module, and comprehensively forming the flight flow modeling model; the simulation solution flight flow module is used for generating the flight flow by simulationaccording to the requirements like the simulation flow rate input by users on the basis of flight flow factor modeling. The invention can improve the reasonability and validity of the generation of the flight flow data, thus creating conditions to ensure the reliability of the simulation flight assessment result and improve the credibility of the simulation assessment result.