Summary

In today's business,specially abroad trade,busniess letters are commonly used for sale.which goal is to established good business relations or express goodwill to get in touch in the near future. So business letters is a key to make the sale better. What's a good business letter and what essential qualities should a good business letter covers? and whether or not there have rules which make a good business letter easy? In fact, rules may be laid down easily to require that a business letter is made brief,friendly,coversational ,tackfull,courteous,clear and intereting. People and circumstances are so different,however this make it difficult to write a good business letter. However, you can still win favorable response to most of your letters if you observe the following principles when writing your letters.
1.Say what you mean in plain english
2.Express what exactly you want.
3.Make what you write sound personal
4.Send what the reader thinks a courteous letter

The Essential Qualities of the Business Letter
1.Say what you mean in Plain English
Most people would agree that a business letter should be understood readily before it fulfill other functions, The language in which a business letter is written should be the simply spoken English that pepople use in their business transaction,not in High-blown Enlish or Legal English.The follwing wirting is cases to express the difference of both.
Abstruse(hard to undersand)
The contract enclosed herewith requires your signature before it can be executed and should be directed to the undersigned.
Natural
Please sign the contract enclosed and return it to me
Even when you know that the person you are writing to is highly literate,it is still a good idea to choose simple words over showy words.Do remember that as rapidness does not mean fluency in reading,bombast does not means literacy or high intellience in writing.

Express What Exactly You Want
Although you may be skillful in your command of language, your fist need as a writer is have something to say.Should tell your readers in the clearest terms what exactly you want and avoid any ambiguous wording and roundabout terms (make readers confused)by writing simply and economically.Don't be obliged to waste time to search between lines for what you are really asking.Study the following revised examples and see why they should be so.
Example

Dear Mr.Brian,

With reference to your recent request for fifty reprints of "How Good Are Sales Aptitude Tests?" in the may issue of Modern Marketing management.These copies are einclosed for your convenience.

With Appreciation for your kind remarks about it article,trusting you will find it very useful in your recruitment seminar in October,I remain,

Your very truly

Revised

Dear Mr.Brian,

Here are your fifty reprints of "How Good Are Sales Aptitude Tests?" I'm pleased you like the article and hope it will be exactly what you need for your recruitment seminar.

Sincerely Yours