I would like to apply a double entry visa for china.

I would like to apply a double entry visa for china. I am swiss citizen and living now 7 years in hurghada/Red sea.
I take here every year a visa, is valid one year. To take a visa for china this is ok or i need this letter from the swiss ambassy in cairo??
When i need this letter, my ambassy understand what you meen about this letter??
Thanks