Abstract: Main ideas and technical approaches to architectural acoustical design of 1446-seats symphony hall in Changsha Concert Hall are briefly introduced. Computer simulation and scale model test were done with Odeon and 1/10 acoustical scale model. So was the site measurement before the first symphony performance. Those objective results match well. And the objective measurements and subjective feedbacks come from performers show that the acoustics of the symphony hall is satisfied. It is proved that the architectural acoustical design be successful.