As part of SQuaRE series of standards, GB/T 25000. 51 is an important basis for commercial offtheshelf software production in China. Based on the introduction of GB/T 25000. 51 standard, this paper analyzes the state quo, problems and impact cause by those problems on software producer in the application of the standard. Measures taken in the standard application by software users is proposed so as to improve standardized production and management of software producers and accelerate the process of standardization.