The invention discloses a method and system for improving alarm quality, and the method comprises the steps: S1, generating a corresponding abnormal log when an instance is abnormal, wherein the exception log comprises an exception error class, exception detail information, an exception interface type, an instance identifier and a cluster identifier; the abnormal error class comprises a basic service class and a business service class; S2, acquiring an abnormal log, and acquiring all abnormal logs of which each instance under the corresponding cluster has the same abnormal interface type as the abnormal log in a preset time period according to the cluster identifier; S3, if the abnormal error classes of all the abnormal logs are business service classes and the abnormal reasons are non-basic service abnormities, judging whether an alarm message which is the same as the cluster identifier, the abnormal interface type and the abnormal error classes exists in a corresponding preset time period in an alarm message table or not; if not, sending an alarm message; and if so, not processing. The number of alarm messages can be reduced, the alarm quality is improved, and the problem solvingefficiency is improved.