As the developer community and code-hosting platforms become the primary means for programmers to access code, the number of user's comments on code has increased dramatically. There are a variety of static and dynamic code quality attributes in user's comments. However, as most of the user's comments are complex sentences, it is difficult to identify the code quality attributes in the comments. Judging the code quality attributes of complex user's comments will help to analyze the code quality information in user's comments and to improve code quality for the developers when they know about user's code usage and code quality attributes. In this study, a method is proposed to judge code quality attributes based on complex user's comments. Firstly, complex user's comments are divided into clauses and a dependency syntactic relation directed graph of the clauses is constructed. After that, the topic of the clause is extracted based on the topic judgment rule of the dependency syntactic relation of the clause. Then, according to the initial feature thesaurus of code quality attribute, the code quality attributes corresponding to each topic are identified, and the representation and the representation result of code quality attribute for each topic are acquired. And finally, the representation and the representation result of code quality attribute in the complex user's comments are analyzed based on the topic processing rule. The code quality attribute related result in the complex user's comment is produced, and the initial code quality attribute feature thesaurus is continuously expanded. The experimental results show that the proposed method can judge the code quality attributes of complex user's comments effectively.