一、邀请函
邀请函通常用于公司对公司之间，私人之间的邀请，根据个人情况，需要在邀请理由那里作出相应修改。具体如下：
Date： 19 May, 2005
Attn: Mr. Paul David Lawrence（被邀请人姓名）
DuPont Films U.K. Limited
Melinex Commercial
P.O.Box 2××2
Wiliton（被邀情人地址）
Middlesbrough,
United Kingdom.
Fax: (44) 164 ×××××（被邀情人电话）
Tel: (44) 164 ×××××
Dear Sir,
Subject: Invitation
We are pleased to invite the following person to visit our Card Issuing and Production center during May 2005.（邀请理由及时间）
Mr. Paul David Lawrence（被邀情人名字及护照信息）
Passport number: 028×××××
Expiry date: 22/07/07
Job title: Application Development Scientist
Duration of Visit: 14 days
I welcome the opportunity to meet with you.
Your faithfully,
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二、公司出具的派遣函，这里分两种，一种是因私，一种是因公，这里大概父母去国外探亲时会用到，也是根据个人情况做更改调整。
因私类
Visa Officer
Canada Consulate General, U.S.A
Re: Guarantee
Dear Sir or Madam, June 15, 2006
We certify here that Ms（名字）is the President and General Manager of our company. She has been working in our company for 2 monthes and his present salary is CD 20,000 Dollars per month.
We are going to send Ms （名字）to visit USA together with her husbanded Mr.（夫名字）during June 20---August 10,2006（时间） for personal reasons.
They will be responsible for all necessary trip expense for themselves. We guarantee that Ms （名字）will return back to Canada(所处国家）on time after the trip. Your issuance in their visas will be highly appreciated.
Thanks a lot for your attention.
Yours Sincerely,
××× Industrial Co., Ltd.（公司名称）
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因公类
Visa Officer
Canada Consulate General, Hong Kong
Re: Guarantee
Dear Sir or Madam, June 15, 2005（发函时间）
We certify here that Mr. （名字）is an international business（职位） of our company. He has been working in our company more than 2 years and his present salary is RMB 8,500 Yuan per month.
We are going to send Mr. （名字）to visit CALESEC & Associates Inc（国外公司名字）. in Canada during June 20---August 10, 2005（访问时间） for business discussions on potential areas of mutual interest.
We will be responsible for all necessary trip expense for all out staff including Mr（名字） We guarantee that Mr. （名字）and all our staff will return back to China on time after the trip. Your issuance in their visas will be highly appreciated.
Thanks a lot for your attention.
Yours Sincerely,
×××× Industrial Co., Ltd.（公司名称）
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雇主证明信
Dear [Name of Employer]:
This reference letter is provided at the request of (or with the written authorization of) [name of former employee]. It is my understanding that [individual's name] has applied for the position of [job title] with your organization. The information contained in this letter is confidential and should be treated as such. It should not be disclosed to anyone within your organization who would not be involved in the hiring decision regarding this individual. Moreover, it should not be disclosed to anyone outside of your organization without the written consent of [individual's name].
[Individual's name] has been employed [or has participated in an internship, cooperative education, or work-study program] by our company since [date] and has held the following position(s): [list positions and salary in each position]. In [his/her] most recent position, [he/she] had responsibility for [explain the person's main responsibilities in this position]. [State your estimation of his/her performance, based upon performance appraisals or other work records that would support your evaluation]. [Individual's name] interacted well with co-employees, was reliable, and showed good judgement. [Give examples.]
If you would like to discuss this further, please feel free to contact me.
Sincerely,