The invention relates to a mobile communication technology field, in particular to an abnormal index analysis method. The method is implemented according to the following steps of: (1) establishing policies and setting corresponding service rules and motions; (2) regularly or immediately calling out corresponding policies according to the external trigger event; (3) extracting service data through a data service interface module and converting the data into fact data objects which can be identified by a rule engine; (4) adjusting the rule engine for carrying out intelligent matching of service rules and calling corresponding motions; (5) calling out corresponding sub-policies if the motion is associated with sub-policies and repeating the step (4) until the motion of service rule matched with the fact data object in the sub-policy is not associated with the sub-policy any more; and (6) recording the ergodic process of a policy tree and the analysis results of intermediate nodes, forming the final abnormal index analysis report and carrying out pre-warning. The method can automatically, quickly and accurately position to the reasons of events causing abnormal index.