score:4
You can enter China up to the date the visa expires, so in theory making five stays of 90 days possible.
However you do need to be wary of the potential for Immigration deciding that you are attempting to live in China without the correct visa, especially if the time between exit/re-entry is only a day or two.
Folks with a business visa are less likely to be questioned about this as work related visits often require long stays. But doing this with a tourist visa may lead to secondary questioning after a couple of entries.
Upvote:1
Yes, you can come to China on the day before visa expires. Multiple entry visa means you can enter China multiple times during the period of validity. 90 days for duration means that 15 months maximum for staying is available.