正规的做法是你们公司打印出来签上名，寄给他，中文或者英文的都可以。

一般是要签字回传的，以证实他收到了。

以下是MS Word里offer的模版，你也可以看看你的Word里有没有自带的模版。

[Your Name] [Street Address] [City, ST ZIP Code] July 23, 2009 [Recipient Name] [Title] [Company Name] [Street Address] [City, ST ZIP Code] Dear [Recipient Name]: We are pleased to offer you employment at Adventure Works. We feel that your skills and background will be valuable assets to our team. Per our discussion, the position is contracts administrator in our legal department. Your immediate supervisor will be Linda Moschell, department manager. Your starting date will be Monday, October 13. The starting salary is $38,000 per year and is paid on a bi-weekly basis. The enclosed employee handbook outlines the medical and retirement benefits that our company offers. If you choose to accept this offer, please sign the second copy of this letter in the space provided and return it to us. A stamped, self-addressed envelope is enclosed for your convenience. We look forward to welcoming you as a new employee at Adventure Works. Sincerely, [Your Name] [Title] Enclosure。