Evaluation of language teaching materials follows the inherent rules of philosophy on value judgment, and absorbs the essential ideology of the mainstream theories of linguistics and language teaching. Cunningsworth proposed the theory of teaching materials evaluation which based itself on the “learner-centered” value and defined “fact judgment” and “value judgment”. Meanwhile, he developed the “description” features and contents in the perspective of linguistic items, reflecting the philosophical considerations and theoretical traces in the early studies on the evaluation of language teaching materials.