It was shown by the experiment carried out in the sprinkling irrigation area that change in leaf water potential was obvious at 14:00 everyday; at the regreening stage the lowest leaf water potential appeared later and lasted a short time and recovered rapidly, while at the booting and blooming stages it showed up earlier and lasted longer; The change in leaf water potential was not completely in consistence with the change in soil water content during the growing stage, because besides soil water content, surrounding conditions also have influence on leaf water potential. A close relationship could be observed between pre-dawn and mid-day leaf water potentials and water content of soil surface at the early growth stage. With the plants grew up, the correlation of leaf water potential with soil water content in deeper soil layers was getting significant. Under sprinkling irrigation, when the irrigation rate exceeded 150mm after the wheat returned green, its effect on leaf water potential decreased.