PRC is working very hard to modernise her military and aircraft carriers are a new area for her. In this, she is way behind the Yanks in technology and deployment, but she has to start somewhere. Her first carrier, Liaoning isn't nuclear powered and will need to refuel often, so PRC will urgently need to develop "friendly ports" for this purpose. I think this endeavour will be even harder than building new hardware, not many nations will welcome large military vessels with warm open arms for refueling. PRC needs to make friends now to fill this role. As for building new aircraft carriers, she is still many years from reaching the latest ones operated by the Yanks today (post Nimitz class carriers), but she is working on it. For the US to be matched, it will be quite some time yet. They aren't worried about PRC's aircraft carriers, they have yet to develop carrier task forces. Meanwhile, all this devlopment is good for employment and marine construction companies though.
Cheers!