Abstract: Ontology mapping as an important means of multi ontologies mutual operation has been widely used in many fields.We propose that the weight functions and function can be designed based on the structure of ontology.Via the ranking learning algorithm, the multiple ontology graph is mapped into a line consists of real numbers.The similarity between two concepts then can be measured by comparing the difference between their corresponding real numbers or the proximity of their positions on ranking list, and thus get the ontology mapping.Experimental results show that the proposed algorithm has high accuracy and efficiency.