Abstract:The study of ecohydrological functions of a Pinm massoniana,forest with anthropogenic disturbance was carried out in Dinghushan Biosphere Reserve, Guangdong Province, during 1997-1999. Mean annual rainfall in this pine forest was 2 209.9 mm, with 83.8%-84.5% of rainfall in spring and summer, and only 15.5%-16.2% of rainfall in autumn and winter. Of the rainfall on forest canopy, throughfall comprised 82.7%, canopy interception 17.2%, and stemflow 0.15%. There was 34% of the rainfall as runoff, and the remainder evapo-transpired． Canopy interception decreased with increase in rainfall, but such decrease was lowered with the increasing rainfal1．Similar feature was observed for stem flow．Stem flow of individual tree showed linear relation with diameter breast height and with stem height under branch(p<0.01)，but did not relate with the size of forest canopy．Runoff appeared only during April to October，with mean annual runof rate 0．34．