lz,你好，簽證有如下分類和特點(diǎn)：
簽證類別 基本材料 有效期 申請(qǐng)時(shí)間（工作日） 簽證費(fèi)用（RMB）
商務(wù)簽證 邀請(qǐng)函原件,派遣函,保險(xiǎn)，戶口簿 1-3個(gè)月 3－7
旅游簽證 經(jīng)濟(jì)證明，準(zhǔn)假信戶口簿，身份證 3個(gè)月 3－7 2500
探親訪友簽證 正式邀請(qǐng)函，經(jīng)濟(jì)證明，準(zhǔn)假信，戶口簿 3個(gè)月 3－7
工作簽證 公司證明，邀請(qǐng)函原件，戶口簿， 依據(jù)工作時(shí)間 2－3個(gè)月
學(xué)生簽證 錄取通知書(shū)，資金證明，語(yǔ)言成績(jī)，學(xué)習(xí)計(jì)劃 依據(jù)學(xué)習(xí)時(shí)間 依據(jù)課程類別

下面給你兩個(gè)樣本（僅供參考）
（1）
(Salutation)

I would hereby invite the members of Beijing delegation totally
4 persons (listed attachment) led by you, to come over to ***
(country) for *** (exposition), which is to be held at *** (place)
during *** (date). Please make the necessary arrangements
for your delegation to arrive in *** (country). During the
exposition, you will stay here for *** days. All your
expenses including international air tickets, local
transportation, accommodations, medical insurances and
all other related expenses during your stay here will be paid
by yourselves.

We are looking forward to greeting you in *** (country) very
soon.

Yours sincerely,

(Signature)


（2）
June 25th,2007

TO:(邀請(qǐng)客戶所在的公司)

ATTN: (客戶的名字)

Re: Invitation for Business Trip

I, (你的名字), on behalf of (你公司的名字) Would like to invite 客戶的名字to visit our office in 公司所在城市, China in the 日期.

The main purpose of this trip is to give you more ideas on business view here. At the same time to try implementing the agreement, which is under discussion/negotiation for some time.

All the traveling and accommodation expenses in China will be borne by your company.

Name:客戶的名字
(passport number: 護(hù)照號(hào)碼 )

Yours truly,


xxxx

然后公司蓋上公章寄走即可,保險(xiǎn)起見(jiàn)可以先掃描給客戶看是否可以.

另外你也可以參考：

你可以參考修改一下，希望能夠幫到你，好運(yùn)@