| The test with "Jinyan No.4" cucumber as material, cucumber seeds were soaked with different concentrations of paclobutrazol before germination and different concentrations of paclobutrazol were sprayed on leaves of cucumber at different stages. The major agronomical characteristics were investigated, and some physiological and biochemical characteristics in the leaves of cucumber were determined at different stages, and plant growth and yield of cucumber were investigated. The main results were as follows:1. Soaking the seeds with different concentrations of paclobutrazol can suppress up growth and elongation of cucumber seedling effectively, that is to say it can reduce height of cucumber plant and leaf area, reduce stem and leaf dry weight obviously, but can increase stems diameter. Meanwhile, the growth of main root of the seedling and the number of the roots is suppressed notably. It improve the root cap of seedling obviously and strong sprout index, the suitable concentration of paclobutrazol is 100mg/L.2. In one leaves issue, leave is sprayed with different concentration of paclobutrazol and repeated one week later, it can make cucumber section shorten, the leaf area reduced, the length of the petiole and petiole inclination dropped, the shape of cucumber becomes more and more compact. The resistance to cold is toned up, the yield can be up to 20%, and the suitable concentration is lOOmg/L.3. Spraying paclobutrazol can increase the resistance to diseases, the principium is that it can change content of amino acid, increase the content of the chlorophyll and soluble sugar. Soaking seeds with 50mg/L and spraying with 100mg/L in four leaf issues is best..
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