Abstract: The temperature of wheat leaves on growing plants in experiment blocks in and out of a shelterbelt system were measured by the extra-red thermometer.Datas showed the following results:1) Shelterbelt appearred a "cooling" effect on the leaves of the plants in the system under dry season or in drought areas.2) A change of the air current strength was made to induce a corresponding variation of eco-enviromental factors which caused a difference between leaf temperature of wheats in and out of a shelterbelt.3) After the strength of a hot,dry air current attended over a definite level,the difference value in front or back of a shelterbelt had a decreasing tendency.4) The mean temperature on leaves of the wheats after the shelterbelt are 1.3℃ which was lower than those in the open field,during jointing stage to maturity.Their accumulated temperature was less than 49.5℃ which equalled to about two days in total.And the date of maturity of those wheats after the shelterbelt was delayed about 2—3 days.