With the continuous growth of China’s economy, financial opening to the outside world has become one of the important means to promote economic development. However, with the continuous acceleration of capital flow, the problem of balance in and out is becoming increasingly prominent. Taking China’s financial opening to the outside world as the research object, this paper discusses how China strategically achieves the balance of entry and exit in the field of financial opening to the outside world, and the impact of this balance. Through the quantitative analysis of China’s financial opening to the outside world and foreign capital flows, it is found that China needs to strengthen the management of capital items and optimize the structure of capital flows in the process of financial opening to the outside world, to achieve the balance of financial flows in and out. As for the impact of the balance of access and access, the analysis of the impact mechanism shows that the financial opening and access and balance can improve the stability of the financial market, provide sufficient liquidity for the healthy development of the financial market, and alleviate financial risks. Such a strategy is of great practical significance for promoting the sustained and healthy development of China’s economy. Therefore, based on the actual situation of China, this paper puts forward some relevant strategy suggestions to guide the practical operation of China’s financial opening up.