Under the arid conditions,transpiration of plants can cause substantial loss of water.Semi-arid loess areas are the key areas for the returning farmland to forest and eco-forestry projects.In these areas,however,potential evapotranspiration is stronger and precipitation is less than other areas.Artificial afforestation is confronted with great difficulties.Spraying the new anti2transpiration foliar fertilizer may provide the necessary nutrients,inhibit transpiration,improve plant water potential,and to some extent,improve the viability of plants.The study uses Rhus ty phina,Robinia pseudoacacia,and Ulmus pumila to investigate the effects of the three foliar fertilizers.It is found that the best formulation is self2made A or self-made B +Ulmus pumila + 300～1 200 times diluted + 10 %～25 % soil moisture.