By using stable isotope techniques, the Platycladus orientalis grown on the rocky hilly area of North China were chosen to investigate air temperature, soil temperature, moisture and δD value in order to discuss the effect of seasonal rainfall on soil temperature, moisture and water movement. The results indicated that: the soil temperature following rainfal decreased first and then increased in the rainy season, and decreased with the increases of depths, whereas in the early dry season the temperature continued to decrease but increased with the depth. No matter in the rain or dry season, the soil moisture increased at first and then decreased after the rain, but dropped with the depth of soil. In rain season, when the early soil moisture was low, the low intensity rainfall could further increase the moisture of surface and deep soil and made the water δD value deplete, which showed rainfall could recharge the surface and middle soil. However, in prior plentiful rainfall period, low intensity rainfall could