Using inverted microscopy and circuit TV, the morphological type, diameter of arteriovenous anastomoses (AVAs) in 11 rabbit's ear chambers were observed. According the joining forms with arterioles and venules in 68 AVAs, there were 4 types: type Ⅰ 58.8％, type Ⅱ 19.4％, type Ⅲ 11.1％, type ⅣV 10.7％. The inner diameters of the AVAs when dialated, measured 36.6?1.67?m at their arterial ends, 16+0.6?m at their narrow points, 66?4?m at their venous ends.This study showed that dilation of AVAs in the rabbit's ear is a graded response which correlates with the rise in intravertebral canal temperature. Some AVAs have multiple venous segments which vary in diameters. It was observed that the behaviour were different after intravertebral canal warming.