一、自然
商业书信的写作必须力求“自然”，不能满篇都是过时的商业行话。商业书信要求可读性强。
为了使信读起来生动有趣，写信人应该尽量避免使用单调的语言，力求使语言结构富于变化。可使用的方法有：
1. 变化文法结构
变换句子的文法结构也可提高信文的可读性。写信时不要千篇一律地使用同一种表达方法。
2.增强书信的可读性，还应注意运用精练的语言
商业书信必须语言精练，能用一个单词的.地方尽量不要使用多个单词。
例如： 高冗余度语言
Inasmuch as we require active consideration prior to making a decision, I am afraid that, in the circumstances, you will have to wait. .
低冗余度语言
As we need to consider before making a decision, I am afraid you will have to wait.
二、商业书信的语气
商业书信中写信人使用哪种语气十分重要，这可以反映出写信人和收信人之间的关系。
积极的语气
以下例子上面三个句子采用提“中性”的语气，而下面相应的三个句子语气则显得积极。这种积极的语气可以使一个句子听上去更有诚意。
中性
I am in receipt of your order for 250 pairs of Niky „Conga‟ sports shoes. .
You failed to send your order to us before the new prices were introduced. ..
We cannot devote much time to your visit as the March Sales figures are being compiled and we are very busy. ..
积极
Thank you for your recent order for 250 pairs of Niky „Conga‟ sports shoes.
Unfortunately, we did not receive your order before the new prices were introduced
We shall devote as much time to your visit as our hectic schedule will permit
以您为先的语气
写信时要尽可能让收信人感到是你亲息写信给他们。
例句：
以我为先
We shall be able to install Cable TV shortly.
I am afraid we cannot deliver at the weekend.
I regret to inform you that we cannot refund your deposit unless you return the goods within a week.
以您为先
You will be pleased to hear that you will soon be able to receive Cable TV.
You can have your goods delivered any weekday.
I am pleased to inform you that you will be able to receive a full refund of deposit if you return the goods within a week.
三、撰写书信时下列几件事情必须避免
1、指责对方犯错
2、推卸自己的责任
3、漠视客户的问题
4、拒绝帮助对方
5、对对方的帮助毫不领情
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