Various formulae for estimation of leaf production in mulberry trees were investigated and obtained. Four varieties of mulberry trees were used as the materials, and four characters. namely branch length (X, 1). branch diameter (X, 2). leaf number per branch (X, 3), and leaf area per branch (X, 4). were studies. The formulae to eatimate the leaf yield of mulberry trees are as follows: 1. Y

v

＝-115.760＋0.068X

＋165.756X

Y

v

＝-221.500＋1.768X

＋38.152X

Y

v

＝-253.826-0.116X

＋289.507X

Y

v

＝ -157.559＋1.063X

＋106.088X

where Y

v

, Y

v

, Y

v

, Y

v

, are showed the estimated yield of the each variety, namely Gaeryang souban, Ilchirye, Nosang. and Suwon Sang No. 4, respectively. X

and X

denote the measured values of branch length and branch diameter, respectively. 2. Y

7/v

＝-118.478-0.665X

＋184.445X

＋2.346X

Y

7/v

＝-217.432＋2.062X

＋35.668X

-1.058X

Y

7/v

＝-206. 249-0.739X

＋268.08X

＋2.770X

Y

7/v

＝-153.383＋0.009X

＋2.024X

＋0.171X

where Y

7/v

, Y

7/v

, Y

7/v

, Y

7/v

, are the estimated yield of the each variety, namely Gaeryang. Souban, Ilichirye, Nosang, and Suwon Sang No. 4, respectively. X

, X

, X

, denote the measured values of each character. branch length, branch diameter and leaf number per branch, respectively. 3. Y

11/v

＝82. 567-1.283X

＋15.501X

＋0.640X

＋3.511X

Y

11/v

＝136.411＋0.311X

＋1.921X

-0. 217X

＋0.214X

Y

11/v

＝150.2Z7-0.139X

＋11.788X

＋0.143X

＋0.381X

Y

11/v

＝160.850＋0.323X

＋66.076X

-0.794X

＋2..614X

where Y

11/v

, Y

11/v

, Y

11/v

, Y

11/v

, are the estimated yield values of four varieties, and X

, X

, X

, X

denote the measured values of four characters. namely branch length, branch diameter. leaf number per branch and leaf area per branch. respectively. The estimation method of mulberry leaf yield by measurement of some characters, branch length. branch diameter. leaf number per branch and leaf area per branch. could be the better method to determine the leaf yield of mulberry trees without destroying the leaves and without weighting the leaves of mulberry trees than the other methods.