Abstract: Towards generation of concept lattice of multi formal context，presents a generating method of object oriented concept lattice of multi context transverse synthesis. At first，utilizes every concept′s extension of each sub formal context，through operation，obtains the extension set of object oriented concept lattice of synthetic context. Then obtains the connotation of synthetic context through approximate operator operation to extension set，and further obtains the concept lattice of synthetic context. The validity and completeness of this method are proved and the experiment results show that this method improves the time efficiency.

Key words: concept lattice, object oriented concept lattice, transverse synthesis, formal context, extension