I am very interested in further studying in America or Australia for a phd.I would like to know some information about it.If anyone can tell me ,I will be appreciated.Management or Trading

The errors in your post would suggest that you need to improve your English language first. Contact the universities you're interested in and see if they can offer you advice. Tell them what your qualifications are and ask if there are other things you need to do before applying - such as pass an English exam.