Validity of a visa refers to the period within which the visa holder is allowed to enter China. Unless otherwise specified, a visa is effective from the date of issuance to midnight Beijing Time on the last date of validity.
The number of entries refers to the number of times the visa holder is permitted to enter China within the visa’s validity.
When all the permitted entries are used up, the visa is no longer valid. Even if there are still unused entries, the visa is no longer valid if the validity has already expired. In either case, the visa holder should apply for a new visa if another visit to China is planned.