Thank you for your message and cv and paper. I welcome you to apply to my department for PhD study, and to my research group. I am not involved in the admission of graduate students but will recommend you to the professor who handles admissions, I think it will be Professor xxx. You must take the English as a Foreign Language exam and also the Graduate Record Exam (GRE) and do well in these, also you will need I think 3 letters of recommendation of which the one from Professor xxx will be most important (I know it will be a good one!). On the application form you should mention that you have corresponded with me.
My best wishes,
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如果是这样的话,我应该怎么回复教授呢?求大神指点。