In my opinion, it is very difficult to find the imformation about bonds. Because there are lots of bonds include US treasury and companies. It is easier to find US treasury bonds imformation in bloomberg.
But for company bonds or notes, I don not have any clues about that.

多谢了，非常感谢！
2# wohc_knarf

Yahoo---- Finance-----Historical Price
http://finance.yahoo.com/q?s=%5ETNX

金融类的历史数据都可以在这找到.

感谢，灰常感谢~~

国债的数据美联储的网站上一大堆，免费下载
COMPSTAT和WRDS也肯定有，应该是免费注册的