The importance of MMORPG CG Movies is increasing with the rapid growth of the MMORPG (a genre of online role playing games) market.Movies are distributed by media such as cable TV, Movie Theater or Internet. And they lead more and more people into the world of games with theirsplendid spectacles, overwhelming scale and surprising 3D technology. It takes several hundreds of millions of wons to make these technology integrated into CG Movies. Thus, if these CG Movies do not properly play their roles, they just become disposable products and even could deteriorate the game industry itself. This thesis aims at describing the principles of CG Movie\'s storytelling by analyzing CG Movies. Besides, it also examines possibilities for them to stand on their foot as a branch of visual contents. For that purpose, this paper deals with the concept and the production of MMORPG CG Movies in the chapter 2. It shows you the aim of making CG Movies, the history of CG Movie development and the production circumstances. These works could be regarded as unimportant. However, they help you see the status of CG Movie in the game industry in sense that the importance of CG Movies has been in upward trend with the recent dramatic growth in the domestic on-line game industry. And analysis of CG Movies Storytelling which is the main purpose of this paper is discussed in the chapter 3. Chapter 3 contains the concept of Digital Storytelling and explains the Narrative Storytelling and the Visual Image Storytelling suggested as a methodology to analyze CG Movies by this paper. Based on the two types of storytelling methodology that this paper suggests, CG Movies are analyzed. As a result, we get to know that CG Movies can be classified into two categories, one of which is the Information Guide Type CG Movie and the other is the Narrative Type CG Movie. This paper takes examples of \'World of Warcraft\' and \'Lineage1\' for examples to explain why the classification is resulted in more detailed ways. As MMORPG CG Movies have become spectacular in association of technology development and immense capital, they have already drawn a lot attraction from people. They deliver gamers much information in summarized form and encourage ordinary people to try playing the game. CG Movies can be largely categorized as Information Guide Type and Narrative Type. The former delivers the information about characters and background with narrative and the latter has well-woven plot structure and harmonizes the narrative with the visual. No matter what kind of style it takes, it is evident that these CG Movies have important status in the game industry. Therefore, we need to find various ways to help them take root as an independent visual content not just as supplements of games.