This paper offers some data concerning cenversational speech levels of Chinese such as （1） long term mean RMS values

（2） RMS values of four pitch tones of Chinese words

（3） peak values

and （4） RMS value in environment of different noise levels.Since conversational speech varies fast with time

and its level fluctuates within a wide range

the dynamic response of the monitor systems （VU meter

Sound Level Meter

as well as Level Recorder） have been tested in order to find a more suitable system for statistical measurement. The results suggest that the Level Recorder is preferable for this purpose.Based on measuring more than five thousand syllables

the statistical distribution of long term speech level have been determined. Moreover

the speech powers were calculated from the so called "Talker’s level" formula of Fletcher rather than from spherical wave

because of the scattering effect of head and torse must be taken into accournt.