Features of the theory of TG 3.Research approach: For Chomskyan linguistics,the research approach is “hypothesis-.deduction method”(假设-演绎法) As for the philosophical basis, Structuralism is philosophically based on empiricism,i.e., logical empiricism(逻辑经验主义)or logical positivism (逻辑实证主义)，and structuralism is psychologically based on behaviorism. Chomsky's TG grammar is philosophically based on rationalism(理性主义)，and TG grammar is mathematics-and-psychology based grammar.Features of the theory of TG 3. Research approach: For Chomskyan linguistics, the research approach is “hypothesis-deduction method” (假设-演绎法). As for the philosophical basis, Structuralism is philosophically based on empiricism, i.e., logical empiricism (逻辑经验主义) or logical positivism (逻辑实证主义), and structuralism is psychologically based on behaviorism. Chomsky’s TG grammar is philosophically based on rationalism (理性主义), and TG grammar is mathematics-and-psychology based grammar