邀请信在形式上大体分为两种：
1. 正规的格式 (formal correspondence)，亦称请柬；
2. 非正式格式 (informal correspondence), 即一般的邀请信。
邀请信在形式上不如请柬那样正规，但也很考究,书写时应将邀请的时间（年、月、日、钟点）、地点、场合写清楚.
范例1 ：
? 邀请参加新厂开工典礼
dear [mr. harrison]:
please confirm that you will be able to attend by advising us of your time —— we can arrange for you to be met. all arrangements for your stay [overnight on april 10] will, of course, be made by us at our expense.
yours faithfully,
亲爱的[哈里森先生]:
本公司新厂将于[4月10日]开始投产，希望能邀请[贤伉俪]来参加新厂开工典礼。
如您所知，新厂的设立是本公司的一个里程碑，而这正是海内外对本公司产品不断需求的结果。我们邀请了所有对本公司的成功贡献一切力量的个人，我们相信，您一定会赏光。
如您确能参加，请来函告知您抵达的时间 —— 以便我们为您安排会晤。当然，所有安排您在[10日晚间]夜宿的费用，皆将由公司代您支付。
范例2：
? 邀请朋友同他们不认识的人一起共进晚餐
dear [susan]:
we’re planning supper at six; that will give us a nice long evening to talk. if i don’t hear from you before then, i’ll be expecting you on the [twelfth]!
affectionately yours,
li ming
范例3：
? 邀请朋友共进午餐 inviting a friend to informal luncheon
dear [zhang ying]:
my niece [mary] is visiting us and i think you will enjoy meeting her. she is a charming, very
affectionately yours,
li ming
范例4：
邀请参加展会
dear sirs/madam:
we’re one of the manufacturers specialized in sanitaryware, concluding one & two piece toilet, wash basin, cabinet basin, pedestal basin, bidet, urinal, counter basin , decorated ceramics and so on. our new models offer superb design and their new features give them distinct advantages over similar products from other manufacturers.
exhibition center : the continental exhibition center
booth number : g-k105 g-k-106
date : apr 15th to 20th 2006
best regards
五种常见的英文邀请信
1) 请对方来发表一个speech，这封信是要感谢对方，同时确认对方对技术设备的具体要求。
dear sir/madam,
im delighted you have accepted our invitation to speak at the conference in [city] on
[date].
as we agreed, youll be speaking on the topic from [time] to [time]. there will be some time for questions.
would you please tell me what kind of audio-visual equipment youll need? if you
could let me know your specific requirements by [date], ill have plenty of time to make sure that the hotel provides you with what you need.
thank you again for agreeing to speak. i look forward to hearing from you. sincerely yours,
[name]
[title]
2) 这封信则是请对方来参加自己公司的一个招待会。
dear sir/madam,
thank you for your letter of [date]. im glad that you are also going to [place] next month. it would be a great pleasure to meet you at the [exhibition/trade fair].
i look forward to hearing from you soon.
yours sincerely,
[name]
[title]
3) 这封信是邀请对方公司派人来做介绍。
dear sir/madam,
sincerely yours,
[name]
[title]
4) 邀请收信人参加自己公司的产品演示会。
dear sir/madam,
we would like to invite you to an exclusive presentation of our new [product].
the presentation will take place at [location], at [time] on [date]. there will also be a reception at [time]. we hope you and your colleagues will be able to attend.
we look forward to seeing you on [date]. just call our office at [phone number] and we will be glad to secure a place for you.
sincerely yours,
[name]
[title]
5) 邀请收信人参加公司总裁的退休仪式，这也是公司人性化公关活动的一种形式。 dear sir/madam,
[location], on [date] from [time] to [time].
邀请函
invitation
尊敬的 先生/女士（dear sir/madam）:
您好！我们诚挚地邀请您参加将于9月18日（星期二）下午15:30在南京市白下区金蝶科技园（中山东路532-2号）举行的“2012南京市白下区金秋经贸洽谈会”。十一届全国政协副主席、全国工商联主席黄孟复先生等国家、省、市领导和部分工商界精英将莅临本次大会。本次活动以“创新、转型、共赢”为主题，通过举办投资推介、交流洽谈、项目合作等系列活动，为参会境内外客商搭建合作交流的平台，共享经济转型发展的丰硕成果。
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