The Research On Fluctuation Characters Of Stock Market For BRIC Based On The Ensembleempirical Mode Decomposition

"BRIC" was proposed by Goldman Sachs for the first time in 2001, which includes the world's four largest emerging market countries, China, India, Russia, Brazil. After the joining of South Africa in 2010, it renamed "BRICS". As the representative of emerging market countries, "BRIC" has become an important force in global politics?economic and trade. And their models of economic development have been received the widespread attention of the international community, the stock markets are also objects of international investors. In recent years, the stock markets of BRIC countries have been leading the global stock market. They are the most investment potential areas in the world. However, the stock markets of BRIC are immature and fragile. The volatilities of stock markets are relatively severe. Due to the differences between stock markets'development history?patterns and so on, the stock markets show different characteristics. So, there is great importance of theoretical and practical significance in researching?inspecting and evaluating on the BICS's stock market volatilities, comparing the existing advantages and problems, and furtherly focusing on countermeasures to the promotion of our stock market's development.Firstly, this paper sorts out and reviews the domestic and foreign literatures about about stock market volatility. Then it reviews and summarizes the theories related to stock market volatility from three aspects, the classical theories of stock market volatility, the factors of stock market volatility and the stock market volatility characteristics. On this basis, it analyzes the shortages of the existing research and the disadvantages of traditional time series model. Then the latest Ensemble Empirical Mode Decomposition is proposed, and also the advantages in dealing with non-stationary and nonlinear time series, the study of the stock market. Secondly, it describes the development of the BRIC stock market and their volatilities. Using the weekly closing price of stock market in BRIC and the Ensemble Empirical Mode Decomposition, this paper decomposes the Index of stock market into three parts, namely high frequency, low frequency and the trend term. Then it endow them economic meanings and compares the differences of each stock market.Finally, after the analysis of the reasons behind the stock market volatility, we must take policy suggestions to promote the development of China stock market, specifically including improving stock market system, improving the corporate governance structure, improving the quality of the investors, and straighten out the government regulatory role.