Abstract: The dynamic coupling relationship between China’s monetization and the complexity of stock price has become an important issue which is worth studying. In this paper, we turn high-frequency information of stock index into monthly data by using sliding window technology, then we construct systematic indicator to measure the complexity of stock price while improving existing measurements; and after filtering the internal structural factors of time series, we discuss and comb the evolution path of coupling relationship between China’s monetization and the complexity of stock price in recent 10 years based on empirical test of the coupling model. The results show that the indicator we constructed is comprehensive and reliable, which can smooth and integrate the results of the existing measure methods. It also shows that the coupling relationship mainly experienced the reversal of special period from recession and intermediate coordinated development after the crisis. From the point of suitability transition view, there is a still more space to improve the degree of development. We can improve the degree of development and then enhance the coordination.