Legal education bears the important mission of imparting legal knowledge, training legal thinking and cultivating legal talents and the reform of law teaching is also a hot topic in recent years. This paper takes the Law School of a university as an example and investigates the status quo of law teaching effectiveness through questionnaires. This paper uses multiple regression analysis method and Pearson product-moment correlation analysis method to study the correlation between various factors in the reform of law teaching and the academic performance and learning effectiveness of students. The results show that the interpretable variable of the teaching method and technique of teachers for the learning time, learning attitude and academic performance is 5.2%, 6.28% and 19.8% respectively, indicating that they are important factors influencing the academic performance of students. These two factors are followed by teaching content, teaching management and exams. This study is of great guiding significance for clarifying the direction of law teaching reform and improving the academic performance of students.