I am a spray nozzle seller in china ,but how do sell it to customers without advertising on B2B web.

Why don't you want to advertize using Business to Business Marketing?

You could make a website.
You could do some local print advertising.
You could do some personal visits to companies that would need your product.

... there are other options, but you should tell us more about your goals - and why you don't want to do what you envision as "B2B web" advertising - for us to be able to help you further.