Dear Prof. XXX:
I am a postgraduate student of （硕士毕业的专业、学校）, I went to your class and deeply touched by your wisdom and academic thoughts. I had the pleasure of reading your book （导师著作）, and can’t be more agree with your point of view and admire very much on your academic level. I would apply for your doctoral student of（考博的专业）.
My postgraduate tutor is Professor XXX, and （硕士时期的研究方向）is my research direction. During my graduate study, I participated in many subjects, including （硕士时期做过的各项研究）. I have accumulated a lot of experiences about scientific research.
Thank you very much for reading my letter , if given a chance to pursue advanced studies, I would highly appreciate. I’m looking forward to hearing from you.
Sincerely，
XXXXXXXX
