Abstract: Caribbean pines, which include Pinus caribaea Morelet var.carlbaea Morelet,Pinus caribaea Morelet var.bahamensis and Pinus caribaea Morelet var.ondurensis,are fast-growing and drought-resistant tree species and have strongability toaccumulate materials.For one year old Caribbean pine seedlings,their heights were 4~5 times,fresh weight were l2~15 times and dry weight were 15~20 times of that of Pinus yunnanensis or Pinus kesiya var.langbianensis;and their assimilates were mainly allo-cated to the aerial part of the plant.The needle water contents of Caribbean pines wereabout 65%~70%, which were similar to that of Pinus vunnanensis or Pinus kesiyavar var.langbianensis. However,bound water contents/Free water contents ratio were 9~11,while that of Pinus yunnanensis or Pinus kesiya var.langbianensis were only 5~7.The transpiration rates of Caribbean pines were only 50% of that or Pinus yunnanensis or Pinus kesiya var.langbianensis. Under induced water stress bypolyethylene glycol(PEG),it was found that Caribbean pines had low decrements of rel-ative water contents,low plasma membrane permeability and strong water retaining ca-pacity;and their chlorophyll contents did not decrease with different concentrations of PEG. The physiological measurements indicated that Caribbean pines had obviouslydrought resistance characteristics.For its strong adaptability to drought environment,Caribbean pines should have better growth performance and higher survival ratethan Pinus yunnanensis or Pinus kesiya var.langbianensis under drought condition.