The Okishio Theorem has aroused worldwide debate，though there is lack of chinese introduction. This paper reviewed the main debate based on Okishio Theorem，clarified the essential difference between Okishio Theorem and the theory of Marx，and pointed out the misunderstanding of Okishio about Marx. Based on all above，we constructed a counterexample of Okishio Theorem to show the shallows of Okishio’s view on capitalist competition. Under the enlightenment of Okishio Theorem，we derived the internal limits of the falling tendency of profit rate caused by technical change，which contributes to the logical consistency of different parts of Marx’s theory.