The develpoment cost of a MMO game could be considerably huge, but it brings ansignificant amount of revenue as well. The products' lifecycle will be in risk while game developer cannot control the extent of inflation of game products limited in their prediction.nThe Netease ThunderFire UX data team have lots of experience of how to monitor andncontrol economic system in successful MMO games, such as "Ghost", "Justice",which bring more 2 billion dollars revenue over the past few years. Through a series of data visualization cases, this report will demonstrate how we monitor the economic system. Specifically, it contains how virtual currency and key items are produced, the consumption, the storage, the price, and the trade between players. Also, it will show how the data support the team regulate and control the games and how does it alert while there are risks or exceptions in games.