resignation letter

Dear:
    I regret that I give my official resignation to the company at this time.   
    I came to the company nearly two years, and I'm very honored to be able to become a member of our company.
    I'm very grateful that the company gave me such a good environment to work and I learned a lot. 
    The decision was a difficult one for me because I have so enjoyed my working relationships here. 
    But due to my personal and my family reason, I have to leave BeiJing.
    Therefore, please accept my resignation.
    I hope my applications can be approved before June 12.

    Yours sincerely, 
    XXX,XXX

Good morning, Sir!
Now i will introduce myself briefly
I am ** years old,born in ** province .
I was graduated from ** university. my major is **.
And i got my bachelor degree after my graduation in the year of 2003.
I spend most of my time on study,i have passed cet4/6 . 
And I have acquired basic knowledge of my major during my school time.
In july 2003, i begin work for ** as a technical support engineer in guangzhou city.
Because i'm capable of more responsibilities, so i decided to change my job.
because i want to change my working environment, i'd like to find a job which is more challenging.
Morover ** is a global company, so i feel i can gain the most from working in this kind of company ennvironment. 
That is the reason why i come here to compete for this position.
I think i'm a good team player and i'm a person of great honesty to others. 
Also i am able to work under great pressure.