摘要： Why the burst of the bubble is important? After the burst of the subprime mortgage bubble in 2008, it has caused a huge impact on the global economic situation. What factors will cause the formation of a bubble in the securities market? If accurately predicting the timing of the bubble is possible, it will be a great importance for the supervision agency to stabilize the market and investor trading strategies. Overall, before investing, it is necessary to understand what the bubble is.