Qurnic commentary based on the order of descending is regarded as one of the modern methods in Quranic commentary. Some assessments, however, have been presented on the validity and authenticity and consequences of the method. The main part of the assessments has centered on possibility or impossibility of agreeable principles and presupposions for the method. The presupposions of the method have been considered by some to be: gradual state of Quran revelation and its agreeability with the method of descending commentary, determinate state of revelation based on the mushaf of Imam Ali (a), inferential state of current commentary, the harmony of subject-based commentary with descending order and the possibility of determining the order of revelation by reference to the traditions in the field. Some critical views can also be found in the field. Though some views on the method`s consequences may not be accepted, main part of the critiques of principles and presuppositions are not acceptable. And without such principles and presuppositions one may not comment the holy Quran based on the order of revelation