Five leaf -area -measuring methods were studied to get a method for continuous measuring of mature leaves of14tropical fruit trees such as wonpee,carambola,atemoya,jack fruit,star apple,guava and so on.The results showed that there was no significant difference between the leaf area values measured by different methods for the same kind of fruit tree with the excep tion of tamarind.Since its correlation coefficient was greatest,the regression equation whose in dependent variable was the product of leaf length and leaf width was better for estimating leaf area of every trial tree than the other two regression equations whose independent variables were leaf length,leaf width respectively.