In case of a BUSINESS VISA ON ARRIVAL you have to print the visa, which you will receive by e-mail, in COLOUR!
You must bring the colour copy to customs! You receive the official visa at the border on Pudong airport in Shanghai.
In case of a TOURIST (GROUP) visa, you do not have to print the digital copy which you will receive by e-mail. You will also recieve a copy by DHL courier, together with your official visa.
You must bring both the copy and the original document to customs in order to enter the country!