Abstract: Greater Brown Wren Warbler (Prinia subflava) and yellow-bellied Wren Warbler (P.flaviventris) are the sympatric species pair in south China.In this paper,the interspecific niche relationship between the two bird species was studied.The authors intended to determine if there is a interspecific competition by means of regression analysis of niche breadth,niche overlaps and complex population density.The results indicated that there was a competition between the two species of Wren Warbler.They did not discrease their niche breadth to avoid competition.On the contrary,they increase their niche breadth respectively to reduce the proportion of overlap so that competition pressure could be discreased.These conditions are favorable to the coexistence.