Abstract: In the process of coalbed methane well production, drainage anomalies are prone to occur, so researches on abnormal drainage identification of coalbed methane are very significant to ensure production. Abnormal drainage types are summarized, and pressure, production, stroke, current are chosen as characteristic parameters. Twelve most frequent production rules were constructed by analyzing the correspondent relationship among these four parameters and production status, based on production system that can simulate human thinking, abnormal production identification is achieved through forward reasoning method. Examples show the technology to identify abnormal production types through rule-based reasoning method has the advantages of simple process and accurate conclusions.