is 3 hour enough for connecting time at Shenzhen airport?

(it's going to be international to domestic, supposing that I need time for immigration procedure and check-in procedure for domestic flight)

I'll be flying from Japan to SZ,then onward to Chengdu all by SZ airlines.
Does anyone know if my tickets and baggage are able to be checked through Chengdu from the point of departure?
Through check-in definately cuts my time for connection.....