There are many problems in Qin Shihuang's educational methods. On the basis of legalism, he took some measures that were conducive to consolidating unity, such as "similarity in writing and similarity in behavior". However, there are many problems in his way of educating his eldest son, Fu Su. According to Records of the Historian, the way Qin Shihuang educated his eldest son, Fu Su, was "teaching by law", that is, letting Fu Su learn the law. This kind of education is considered to be one of the biggest mistakes of Qin Shihuang, because it makes Fu Su heartless and indifferent to people's sufferings, and only knows how to strictly enforce the law.