Abstract: the seeds of wheat and corn were dipped in water-soluble substance distilled from peganum harmala, before incubate in greenhouse. The moisture of leave tissues was determined at seedling period. In this experiment, we found the water of wheat leaves increase 0.6%~3.06 % for wet weigh and 17%~99.73 % for dry weigh,The oppositely containing the water increase 0.24%~3.42 %, The water saturation decrease 0.24%~3.39 % 。The resulte of the leaves of corn is similar with wheat。 it indicates that treat with extracts of peganum harmala could enhance the drought resist ability of wheat and corn.