Based On CEV Model For Pricing Asian Options Under The New Trinomial Tree Methods

China’s financial market is in development stage, is not mature, the option Tools can be very scarce, only some of our categories of products warrants can be used as options products. But to make up for this part of China’s financial market gap, we must not only continue to promote sound development of China’s financial markets, but also greatly enhance the research options and the introduction of products, which China is a very severe test. More serious problem is that we are faced with rapid economic globalization, coupled with China after the stock market but also to take on more responsibilities, so the introduction of more sophisticated European or American or Asian options option, and how to make better adapt to China’s national conditions of China’s scholars, including the world’s scholars should focus on consideration.Over the last decade, as the world economy continues to develop, based on standards established by a variety of options and option combinations, such as the advent of derivative options, making the standard option has often been talked about, was praised as a standard option so a variety of financial Tools of the core and foundation. Since the last century, the wave of financial innovation has been the emergence of a large number of "new options", which features the option to path dependence, represented by non-standard options in the market place in the high volume of transactions, the frequent development can be described as another option to peak. Singular means that the structure of exotic options peculiar, unprecedented, or the option for the options, package options, or for Asian options, lookback options. Prosperity and development of new options has its basis, for example, such options more flexible, according to the needs of investors with different design products; in recent decades is the development of financial mathematics for some time, it also created a non- less financial derivatives; the risk of exotic options is clearly much smaller than the standard option, the contract price is much cheaper, which is most attractive to investors eye of one point. Path-dependent options in the Asian option is the study of exotic options are more in a new option.Stock price volatility is the degree of change depict a core parameters, and in the practical application of the model, the volatility generally been the default is a constant. Clearly, this and the actual situation is a great difference, this inconsistency is mainly manifested in the observed derivative securities by financial markets implied volatility of prices exist "volatility smile" phenomenon. So, obviously the fact that the model assumptions about the volatility is inconsistent with reality. Also, most of the financial statistics show that the volatility over time, usually not a constant, and studies have shown that stock price volatility and there are still some inverse relationship. In short, accurate estimates of the size of volatility for the development of option pricing has a great relationship.This paper is to study many types of Asian options, the pricing process is difficult to complete using a unified approach, which is when the topics of the first considerations of the tree to be achieved through the new CEV auxiliary Asian option pricing calculation, simplified options Pricing the computation process for the introduction of options markets and in Asian option pricing methods to provide reference.