The Sutra of Perfect Enlightenment was translated under the common circumstance that the country came to organize and several monks then completed by organizing spontaneously in the form of "folk translation workplace". But after completing, the monks didn't implement the procedure to declare the translation into Buddhist Scriptures. Also, they didn't compile and revise the record of the translation process, or they did it but unfortunately, the translation scripture couldn't be collected by Zhi Sheng or someone else. On the basis of "writing with reason" principle, the ancient Buddhist historians recorded the words which showed the reciprocal contradiction of the translation. After that, Zong Mi got the writing scripture of the Sutra of Perfect Enlightenment which was circulated in the Buddhist area and he also collected the exegesis of the scripture. Then, he came out with the book A Complete Commentary on Sutra of Perfect Enlightenment and some other books. Being published, the book was circulated gradually in the Buddhist area and it laid great emphasis on the Chinese Buddhism in the mid-Tang dynasty. Zhi Sheng and Zong Mi simply doubted the insufficiency and errors of the record of the translation process but never doubted the authenticity of the Sutra of Perfect Enlightenment. The modern scholars have excused the divergence of the ancient documents and standardized themselves in the consideration of Buddhist factions, and then came out with the conclusion that the Sutra of Perfect Enlightenment was a "fake scripture". This result lacks persuasion.