Abstract: An obstacle-avoidance test was used to determine the avoidance ability to stationary obstacle of ten leaf-nosed bats (Rhinolophus rouxi ) . of these seven were used to test their obstacle ability during natural predation.The mean percentages are 77.07±0.86% and 85.58±1.11%, respectively. It is shown that the reaction of avoidance ability to stationary obstacles was significantly higher (P<0.001) during predation than non-predation periods.