Abstract
Bonds are considered as one of the mid-tern or long-term investment options for financial commodities. Scholars constantly explore the causes of bond prices or bond yields in different perspectives because of the large among of the US Treasury in the financial market. However, they cannot find a proper model which can be fully interpreted the casual relationship of bond prices and macroeconomic factors. As a result, this study attempts to analyze the Europe bond market which is different from the US bonds through text mining. It takes the Germany government bond yields as a main variable and considers the official document of the European Central Bank to analyze positive and negative sentiments by exploring whether the information of the official document are relevant to the Germany government bond yields. In addition, this study also considers the economy data which may help us to predict the trend of the Germany government bond yields.