Abstract:In the field of software testing, as the lack of uniform test description language (TDL) became constrains of improving the efficiency and reusing the test cases, defaults-based Software test description language (DBSTDL) is designed that made a distinction to the traditional TDL what makes equipment and signal as center. The new TDL is designed around software defaults and tested software double mainlines, and containing six types of words, three types or more than 100 sentences, three groups of sentence groups, two types of combination. By DBSTDL, a database of typical software defaults and test cases is created to verifying the thought of establishing database by DBSTDL.