Semi-arid loess regions are the key areas of returning cultivated land to forest and eco-forestry projects in our country.As a result of the special climatic conditions,rainfall is relatively short and potential evapotranspiration is relatively great.Transpiration can cause considerable loss of plant water which leads to water deficit and dehydration and great difficulties in artificial afforestation.Spraying anti-transpiration foliar fertilizer on leaf surface can not only provide the necessary nutrients required for plant growth,but also inhibit plant transpiration,improve plant water potential,reduce plant water evaporation,and improve the survivability of plants to some degree.The study uses Xanthoceras sorbifolia Bunge,Amorpha fruticosa,and Rhus typhina in the arid and semi-arid area of the Loess Plateau as the main research object and two self-made anti-transpiration foliar fertilizers and the foliar fertilizer which has been promoted on market as the main basis,to explore the effects of self-made fertilizers on reducing the plant transpiration by orthogonal experiment.Results show that the best formulation is self-made C + Xanthoceras sorbifolia Bunge or Amorpha fruticosa + 800～1200 times diluted + 12%～22% soil moisture,which reduces plant transpiration rate most obviously.