Spatial distribution patterns and population dynamics of Tetranychus kanzawai Kishida (TKK) were studied during 1994–1995 in open-air strawberry gardens in Fuzhou, China. The study showed that eggs and active stages of TKK were aggregated during different periods and in different gardens. The Iwao's linear regression was = 5.883 + 2.009 m (r = 0. 948) for eggs and was = -20.746 + 3.007 m (r = 0.897) for active stages. The mean densities and indices of mean crowding of both egg and active stages fluctuated through time. During the whole growth period of strawberry, the densities of eggs and active stages were correlated. The populations of TKK peaked near late December and mid February and exploded towards the end of the growing season (May of the second year).