In order to select data mining services that meet the requirements of users better,this paper uses extension matter-element model to describe data mining service and the requirements of users.By doing extension analysis of data mining service,the similarity degree between candidate data mining service and user required service is calculated.Data mining Quality of Service（QoS） constraint-element of the user is structured.It designs a method to evaluate the similar services and helps the user to choose data mining service which meets the requirement.Experimen...
