1. A management system for machine tools, comprising: at least one machine tool; and a remote monitoring host connected to at least one machine tool via a network, and the remote monitoring host comprises: a storage unit recording a transaction database which comprises a plurality of transaction data, wherein each transaction data records a plurality of parameters corresponding to a failure category, and the failure category is one of a plurality of predefined failure categories when an abnormality occurs in the at least one machine tool, in which the failure category is corresponded to the abnormality, and the parameters are the parameters whose parameter values are retrieved from the at least one machine tool, having the abnormality, by the remote monitoring host according to the failure category; and a processing unit determining a specific failure category according to a current abnormality occurring in one of at least one machine tool, and generating at least one suggested combination of parameters according to the specific failure category and the transaction database, wherein the specific failure category is one of the predefined failure categories, and each suggested combination of parameters comprises a plurality of associated parameters, which are commonly retrieved for the specific failure category, the at least one suggested combination of parameters corresponding to the specific failure category is mined from the transaction data of the transaction database using a data mining technology developed by association rules, and the parameters corresponding to the failure category recorded in each transaction data are set as associated items in the association rule.