From an analysis of large amounts of data, the authors propose an idea that the control of the suspended river of the Yellow River should be theoretically based on the cybnetics of the tri-systems of earth 's crust-foundation-embankment and methodologically based on the integration of engineering control and environmental control, environmental control and economic development, geological-engineering control and hydraulic engineering. On that basis, an expert system of the stability evaluation of the suspended river in the lower reaches of the Yellow River has been developed using the artificial intelligence technique, and a stability analysis of the Tieqiao-Penglouji reach of the suspended river in the lower reaches of the Yellow-River near Zhengzhou has been performed using this expert system. The result of the evaluation coincides with the actual situation.