Abstract: By classifying a data set into different partitions,a granular tree based on the data set was obtained．By using the information of associated elements,a relation called an associated relation was introduced,and connections between two granular trees based on different data sets were established,so that two associated chains were identified,which are connected with each other by an associated element．Because the granules in each associated chain gradually change from a coarse state to a fine state,the associated element model closely links with the changes of the granules,which is consistent with the data processing mode of granular computing．Consequently,as the basis of an algorithm,a mathematical model was created．It can be used to describe the relationship between talent supply and demand．Also,an example shows the process of using the model to carry out data processing.

Key words: Hierarchical algorithm,Granular tree,Associated element,Associated relation,Associated chain