Code review is an important mechanism in the distributed development of modern software. In code review, providing the context information of the current changes can help code reviewers understand the evolution of a certain source code quickly, thereby enhancing the efficiency and quality of code review. Existing studies have provided some commit history tracking methods and corresponding tools, but these methods cannot further extract auxiliary information relevant to code review from historical data. Therefore, this study proposes a novel code change tracking approach for code review named C2Tracker. Given a fine-grained code change at the method (function) level, C2Tracker can automatically track the history commits which are related to the code changes. Furthermore, the frequent co-occurrence changed code elements and relevant code changes are mined to help reviewers understand the current code changes and make decisions. Experimental verification is conducted on ten well-known open-source projects. The results show that the accuracy of C2Tracker in tracking historical commits, mining frequent co-occurrence code elements, and tracking related code change fragments are 97%, 95%, and 97%, respectively. Compared with existing review methods, C2Tracker greatly improves its code review efficiency and quality in specific cases. Additionally, reviewers acknowledge that it can play a significant role in helping improve the efficiency and quality of most review cases.