China has recorded remarkable growth rates for three and a half decades. Recently, the annual growth rate has slowed down and is projected to decline gradually to 5 % by 2030. This article examines how high economic growth was realized in the past and whether it can be sustained in the future. In doing this, the paper takes into consideration the projections about future growth rates. The article emphasizes that the main reason for the reduction in the future growth rates is the unsustainability of the currently high investment rates in the long run. In addition, the diversification of financial instruments for the already high savings is important. Necessary improvements in the financial sector are discussed in conjunction with the long term sustainability of economic growth rates.