Your Chinese passport can be renewed 12 months before it expires. If you won't be traveling internationally, you could wait till September when the embassy will be down in Charlotte NC. But online appointment is required.
Chinese passport should be renewed six months in advance to allow time for processing in case something arise. Hence, 13 months is plenty of time. The Chinese embassy in the US is located in DC but there are several consulates in several large American cities__none in SC u unfortunately .
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