A field experiment was conducted to study the changes of stomatal parameters, gas exchange parameters and chlorophyll fluorescence parameters in the leaves of 1-year-old J. curcas L. which grew in different soil water content intensities (80%, 50% and 30%FC) for three months. The results showed that the stomata length(Sl),stomata width(Sw) and stomata area(Sa) were increased evidently while the stomatal density(Sd), stomatal conductance(Gs), intercellular CO2 concentration(Ci) and transpiration rate (Tr) decrease with the decreasing of soil water content. In addition, net photosynthesis rate (Pn), maximal fluorescence (Fm), optimal/maximal photochemical efficiency of PSII(Fv/Fm), quantum yield of photosynthesis(Yield) and the parameter of photochemical quenching(qP) had the trend of decrease -increase -decrease with the decreasing of soil water content, they had the highest values under 50%FC, while the change trend of minimal fluorescen(Fo) is oppositive,with the minimum observation number at 50%FC. The ratio of the width to the length of stomata(Sr) didn't change much. It was concluded that low soil water regime(50%FC) is preferable to cultive J. curcas L.
