This paper analyzes the text knowledge expression technology, introduces the state space method, two aspects of value method, and production system, constitutes the ice situation grade standard according to text rules, which measures the ponderance of the ice situation. Obtains a new set of rules by extracting text metarules, selecting control strategy, eliminating rules conflict ,and integrating rules. On the state space method ,deals rules with grade standard and two aspects of value method ,and get a new set of rules described in numbers and symbols. In the VFP software platform, achieves decision-making of the implement condition about different types of ice-melting and de-icing methods through program.