| Critical discourse analysis (usually abbreviated as CDA), as a new linguistic method, owns many features of modern linguistics. It is an integrated language study, laying the stress not only on the structures and meanings of language, but also on its pragmatic application in social context. With the development of science and technology, more methods of communication appear, in which mass media are important ones. Mass media become main ways of people knowing the world. Mass media include many instruments, in which television, advertisements, newspapers, magazines and official documents are familiar ones in people's life. With the studies of relationship between language and ideology going deep, more and more people begin to analyze news discourses from the perspective of CDA.In the present study, the author introduces CDA including its evolution, research areas and aims and some key concepts related to it. Its development home and abroad is introduced as well as some famous persons who make great contributions to it and their achievements. More and more people analyze news discourses from the perspective of CDA which is also helpful to analyze the hidden ideologies. Therefore ideology is introduced here, including its definitions given by different scholars, its relationship with language and the analytical methods to expose it. At the same time the author introduces the theoretical base of the present study, that is, the base of CDA. Many theories contribute to CDA, but the author mainly wants to introduce Halliday's Systemic-Functional Grammar, especially his theory of metafunctions, which provides useful analytical methods for CDA.In the data analysis, the author goes on a deep study in the sample English political reports which concentrate on the March 14th Riots happened in Tibet, China. The analysis is based on Halliday's theory of metafunctions to analyze the different ideologies reflected in the sample reports and the features of the sample news discourses by studying the realization of the ideational function, interpersonal function and textual function. In order to expose hidden ideologies and reveal different news features, the author selects six English political reports, which concentrate on the riots, from the websites of English mainstream newspapers to do a contrastive analysis. These media sources include Beijing Review, China Daily and People's Daily from China, BBC and Times Online from Britain and Time (a partner of CNN) from America.In the present study, the author regards those reports from America and Britain as Group A and those from China as Group B. The author gives a contrastive study of how all kinds of realized methods of three metafunctions work in the sample reports. As a result the author finds that, though all reporters in two groups select the Tibet event which has high news value, their reporting focuses are greatly different. And the different focuses make their reports show differences on news features and the hidden ideologies. Based on the concrete statistic analysis, we come to the following findings. The reporters from China give true and objective reports on the March 14th Riots which reflects their ideologies are to report the violence objectively and fairly without bias to any side, but the reporters from America and Britain give biased, even distorted reports. Their focuses are to find excuses for Dalai's separation which reflects that they are, to some extent, the supporters of Dalai.
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