A research was carried out to determine the compensation effects of water stress and re-watering on the function of root shoot by pot experiments. The results show that the post-drought re-watering has obvious compensation effects to rice on the function of root shoot, which is particularly significant after short-duration heavy drought at the late tillering stage and light drought at the early jointing stage. Post-drought re-watering mainly embodies compensation effects in improving the physiological activity of neonatal crop organ. 