Through the quantitative statistical analysis of opinions，this paper finds that the “Bǎ” structure has the following differences against general discourses: from the perspective of whole structure，the proportion of the internal components of a single sentence is higher than that of general discourses. From the perspective of syntactic components，“Bǎ” structures without subjects have dominance，and tend to choose “Jiāng” as prepositions；the objects can choose verb phrases；and the predicate part often choose verb-object phrases. These differences above are also the characteristics of the “Bǎ” structures in opinions. Behind the characteristics are the joint effects of pragmatic and cognitive motivations，of which the pragmatic communication scene of the opinion language as the pragmatic motivation is the main factor. These motivations put forward requirements on the use of language in the writing of official documents，and have certain guiding significance. These motivations put forward requirements on the use of the “Bǎ” structures in official documents，and have certain guiding significance.