不知道你是申请研究生还是本科，我这里有2个模板，你可以试一下，不过是英文的。
                                               Your name
                                               Home Address
                                               Tel/Fax
                                               Email Address
                                               Date
Office of Admissions
Name of University
Address 
Tel/Fax
Dear Admissions Officer:
     This is xxx,I am a junoir /senoir at xxx high school in xxx,China 。
  I am a citizen of xxx(country's name )and will graduate in June/July of xxx year (date)。I am very interested in attending your school for the fall term of xxx。
  Could you please put me on your mailing list and send the following information to me as soon as possible :
  1。A university brochure and catalog 
  2。
  The student application form for undergraduate admissions 
  3。Information concerning finanical aid。
  Any other information that would allow me be familiarized with your school or may be necessary for the application process。
  
  I would highly appreciate receiving this information at your earlist convenience 。Thank you for your prompt attention to these requests。
  
                                             Sincerely yours
                                              Your signature
。