The invention discloses a filename specifying system of an automobile body technical solution and a usage method thereof. The filename specifying system comprises an annular structure code table, a load path code table, a relevance code table, a vehicle type code table and an evaluation type code table. The usage method of the filename specifying system comprises the following steps of: querying an annular structure code to which the technical solution belongs in the annular structure code table; querying a load path code to which the load path code belongs in a load path code table; queryinga correlation code to which the correlation code belongs in a correlation code table; querying a vehicle type code to which the vehicle type code belongs in a vehicle type code table; and querying theevaluation type code to which the evaluation type code belongs in the evaluation type code table. The filename specifying system has remarkable regularity and a clear using process and is easy to master. The filename has a spatial positioning function and a concise characteristic, and is easy to identify. Through the implementation of the system, the research and development efficiency is remarkably improved. The research and development cost is reduced, so that the system has important engineering application value.