How to get rid of ps red and China background?

I don't know if you are talking about how the logo of China moved to the background.

The background of this picture is pure white. You can copy a layer of the original picture and adjust the color level after decoloration to make the whole logo pure black.

Then click the Load Channel as Selection button at the bottom of the Channels panel.

Hide this black-and-white layer, select the original layer (the original layer can be unlocked, or another layer can be copied), and press the delete key to delete it.

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