Upper limits vary from as little as ¥2000 to ¥3000. ¥2500 is fairly typical, but multiple extractions from the same machine are anyway usually possible. The airport also has exchange counters and machines that take in foreign bills and spit out RMB. In short, you'll have no trouble at all getting as much money as you want, and ¥1000 is no problem at all.

Peter N-H
China