How can I get of the information and news about convertible bonds.if I want to buy convertible bonds,where can I get their cusip number and their detail?

In absence of a broker contact, there is a web site that furnishes CUSIP numbers if you enter the name of a corporation: Symbol Lookup (http://activequote.fidelity.com/mmnet/SymLookup.phtml).
Use the "Search" field and this will get you started. Once you enter a company name, all securities issued by the company will appear with their respective CUSIP numbers. Otherwise, you can request this info from a broker who specializes in this type of security.