Let me know full details & requirements of VISIT & BUSINESS visa of China

From what you stated, I get that you still don't have a cooperator in China and you will just go to China for an ivestigation, right? Then I think you may just apply for a China tourist visa for this. Strictly, you should apply for a China business visa, since your travel purpose is related to business rather than sightseeing, visit relatives or private things. However, you will not be able to get the Invitation letter of a duly authorized Chinese unit or the confirmation letter of invitation from the China side, which is necessary for the China F business visa application. Thus, you may just apply for a tourist visa, since your travel can also be considered as for private affairs in China.

Anyway, the documents you haev to prepare for the visa application are:
1. your Bangladesh passport that should has over 6 months validity and over 2 blank pages left when you submit the application
2. truly and fully filled visa application form affixed with a certificate photo
3. round-trip air ticket
5. financial proof such as bank statement or tax receipt.

FOLLOW UP MAIL REGARDING VISA FOR CHINA
Thank you Doris for your beautiful feedback on Apr. 3,2012 01:20 regarding my quiries. Now I've some other things to know , Please:1. When my passport prepared (26TH JUNE'2008 ) then I was serving in a private company that's why my profession showing in my passport as "PRIVATE SERVICE" but presently I'm doing my own business ...Is there any problem to get my BUSINESS VISA to china ( If somehow I can get invitation letter from any of china counterpart after close contact with them ? , If can't , For getting TOURIST VISA , this shown profession on my passport , will create any problem ??2. If I understood correctly " L VISA FORM " for Tourist & " F VISA FORM " for business.... Thus can you plz provide me the URL to get both two categories VISA FORMs soft copy ,& also Both of categories visa cost in BDT), processing time, necessary docs which need to submit & if any guidelines etc...3. For TOURIST VISA you mentioned :A. your Bangladesh passport that should has over 6 months validity and over 2 blank pages left when you submit the application >>>My passport valid till 25th June ' 2013. Is that OK ?B. truly and fully filled visa application form affixed with a certificate photo >>> Kindly explain about Certificate photo. C. round-trip air ticket >>> Kindly advise the most reasonable airline's name & their round trip cost (In BDT) ; D. financial proof such as bank statement or tax receipt >>> Two docs needed or any one will be OK...? Kindly explain a little more for my understanding...Plzzzzz. Thanx again for your quickest outcome. Waiting for your further guide/advise. W.B.Rgrds// Kazi (EMAIL : yahoo.com|kaziarmansohel ).

1. I don't think it will affect your visa application if only your passport has enough validity and blank pages on.
2. All tyeps of China visa use the same application form which can be download at the bottom of this page https://www.travelchinaguide.com/embassy/visa.htm. A single entry China visa costs 2050 Takas and takes around 4 working days.
3. I think your passport is ok. A passport standard photo will be ok. It doesn't matter which airline's plane you will take. Either bank statement or tax receipt is ok.