This paper takes the 2006 to 2014 provincial panel data as the support to comb the previous financial development theory and selects the AK model in endogenous growth theory with practical value．What’s more，it takes financial interrelations ratio as the variable．Based on the PSTP model，this paper carries out empirical research on the functional mechanism of financial development on economic growth and finds out that it has complicated nonlinear mobility effect on the economic growth． What’s more，combining the actual conditions，this paper suggests that in different economic development stages and regions with different economic levels，we have to carry out targeted policies and pay more attention to the internal quality of financial development．

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