The switching backplane of fiber array has a great prospect in large-scale multirack connection system as connecting equipments. In order to conquer the difficulties in producing the backplane of dense fiber array, starting from the traditional structure of Crossbar of switching backplane, an original method of programming the structure of backplane by gradual routing is adopted,and applied to the preparation of backplane. A set of outfit and the flow of producing are also proposed to predigest the process of producing. The advantage of this method is testified through the preparation of a sample backplane and its experimental results.