e stability of banking system has caused wide concerns since the global financial crisis. e present paper focuses on studying the stability of a banking network system in the case that the banking network system suffers the dynamic macroeconomic fluctuation shocks. We firstly construct a banking network system with a scale-free structure, then let the banking network system suffer the dynamic macroeconomic fluctuation (here, we consider three kinds of situations; the macro economy fluctuates in downward, upward, and random trends, respectively). en, we study the stability of the banking network system under each situation. Firstly, the results show that the scale-free topology has an important effect on the stability of the banking network system at each macroeconomic fluctuation situation. Secondly, the investment payback period and the ratio of investment to deposit have a large effect on the stability of the banking network system in the cases of dynamic macroeconomic fluctuation. In addition, our further studies find that there is an optimal ratio of the investment to deposit under various macroeconomic fluctuation scenarios, which divides the banking system into stable and unstable regions. Finally, we discuss the regulation strategies for banks, which may provide decision supports for the relevant regulatory authority. connectivity helped to resist risks at lower shocks, but it had the opposite effect at higher shocks. Lenzu and Tedeschi [13] constructed an interbank network model with different network structures to study the stability of the heterogeneous banking system in the face of random shocks and found that the banking system with the random network was more stable than that with the scale-free network. Caccioli et al. [14] proposed a network approach from the perspective of risk contagion to calculate the stability of the financial network due to overlapping portfolios. ey used the "branch process" to understand the financial contagion and found that there was a critical point of leverage that the financial network was stable when the leverage was lower than the critical point, while it was unstable as the leverage increased. Karimi and Raddant [15] investigated cascades of defaults in an interbank loan market and found that the ability of a defaulted institution to start a cascade depends on an interplay of shock size and connectivity. In addition, Degryse and Nguyen [16] had also shown that the size of interbank assets, the distribution of banks' claims and liabilities, and the level of thebanks' capital adequacy ratio were the main causes to the interbank risk contagion. e empirical studies of Mistrulli [17] and Kanno [18] showed that the contagion risk in the banking system was affected by the size of default banks. e abovementioned studies explored the stability of the banking network system, but all did not consider the effect of the dynamic macroeconomic fluctuation on the banking system. While, considering the slowdown of macroeconomic growth in China since 2008, the growth rate of banks' ...