Abstract: Based on the meteorological data and the corn growth period data from 1961 to 2009 in Chengde of Hebei province, the daily water requirement of spring corn was calculated by using Penman-Monteith formula recommended by the FAO of the United Nation. The changes of spring corn water requirements, the budget in different growth period and its inter-annual variation were analyzed．The effect of meteorological factors on spring corn water requirement was discussed. The results show that the mean total water requirement and its water budget in Chengde are 522.5 mm and 69.4 mm respectively during the growth period of spring corn. The daily water requirement of spring corn firstly increases gradually and then decreases. The spring corn water requirement has a close relation with the meteorological factors.

Key words: spring corn, water requirement, water budget, chengde, Spring corn, Water requirement, Water budget, Chengde