Although all schools of thought criticized the values of others in the pre-Qin period, only the criticism of Confucianism, called as rectification, was rationally self-conscious. Xunzi eventually developed a doctrine of rectification. It represents the highest level of value criticism among the pre-Qin philosophies in two senses: Firstly, Xunzi shows his insights in the criticism of twelve thinkers with systematic arguments full of unique charm of philosophical thinking; secondly, Xunzi takes dao as the foundation of his doctrine of rectification. However, Xunzi’s doctrine of rectification is inconsistent since he fails to unify the ontological dao in Laozi and the Confucian dao at the level of value.