First, His book had great achievement on hermeneutics.It included ways and content of textual research, such as phonetic notation, annotate words, annotate sentence, annotate institution, etc.

• 其次，在校勘方面，作者考查出大量的讹文、衍文、脱文，而且正确地用了校勘四法，即对校法、他校法、本校法、理校法，成绩斐然，做到前人“解其所未解，申其所未申”。