This study was carried out in order to estimate site indices in unstocked land by the physicochemical properties of forest soil and to investigate the distribution of the physico-chemical properties by stands and horizons in soil. At each site, there were surveyed 14 items of the physico-chemical properties, namely, content of sand, silt and clay, soil pH, organic matter, total nitrogen, available P₂O_5, cation exchange capacity, exchangeable K^+, NA^+, Ca^(++), Mg^(++) and base saturation. The number of sites was as follows ; I) In Pinus koruiensis stand 83 sites were selected respectively to A and B horizon in soil II) In Larix leptolepis stand 80 sites. III) In Pinus densiflora stand 78 sites. IV) In Pinus densiflora for. erects stand 77 sites. About the analysis method of data was used stepwise regression analysis method. The results obtained were summarized as follows : I. In each stand texture was investigated to loam and soil pH ranges were from 4.5 to 6.7. II. The mean amounts of O.M., T.N., Avail, P₂O_5, and Exch. Ca^(++) of A horizon were more than those of B horizon in soil of P. koraiensis, L. leptolepsis, and P. densiflora for. erects stands. III . The mean amounts of O. M., T. N., Exch. Ca^(++) in sail of L. leptolepis stand and Avail. P₂O_5 in B horizon were more than those of the other stands. IV. The mean amount of the chemical properties in soil of P. densiflora stand was the least of all stand. V. The multiple regression equations resulted out were as follows ; i) A horizon in soil of P. koraiensis stand : S.L. = 14.51629-0.24095 O.M.+2.47514 T.N.-0.09037 Clay-0.01683 Sand+0.39836 Exch. Ca^(++)-0.49329 pH-0.34284 Exch. Mg^(++)-0. 00733 Avail. P₂O_5-0.01302 Base Sat. (R²=0.9456). ii) B horizon in soil of P. koraiensis stand : S.I. = 4.06774-0.02141 Avail. P₂O_5-2.89248 Exch. Na^++4.50564 T.N.+0.01873 Sand-0.19238 O.M.+0.55940 pH+1.48477 Exch. K^+-0.99680 Exch. Mg^(++)+0.14728 C.E.C.+0.05125 Base Sat. -0.37548 Exch. Ca^(++)+0.00906 Clay (R²= 0.9631). iii) A horizon in soil of L. leptolepis stand : S.I. = 18.69537-0.01064 Avail. P₂O_5-0.04198 Sand-0.28872 C.E.C.+0.76670 Exch. Mg^(++)-0.03249 Clay-0.04261 Base Sat.+0.31676 Exch. Ca^(++)+0.38499 pH + 1.42682 T.N. -0.05667 O.M. + 1.04870 Exch. Na^+(R²=0.9710). iv) B horizon in soil of L. leptolepis stand : S.L.= 17.45104+ 1.17996 Exch. Ca^(++)+0.00966 Sand-0.01253 Avail. P₂O_5-0.05297 Base Sat. -0.05505 C.E.C. - 0.02919 Clay - 5.16177 T.N.-1.93333 Exch. Na^+ +0.09382 O.M.-0.28979 pH (R²=0.96471). v) A horizon in soil of P . densiflora stand : S.I. = 14.07953+0.65342 O.M.-0.02537 Avail. P₂O_5-2.80197 Exch. K^+1.00567 Exch. Mg^(++)0.60274 Exch. Ca^(++)-0.09360 Clay-0.13822 C.E.C.-0.02409 Sand-5.23586 T.N.-1.86989 Exch. Na^+(R²=0.9851). vi) B horizon in soil of P. densiflora stand : S.I.= 3.25650+27.18532 T.N.+0.01602 Base Sat.-2.85151 Exch. K^++2.78540 Exch. Na^+-0.51468 O.M.-0.01889 Sand+1.10189 pH-0.18739 C.E.C.+0.02128 Avail. P₂O_5+0.03342 Clay(R²= 0.9803). vii) A horizon in soil of P. densiflora for erecta stand : S.I.=3.70224+6.75128 T.N.+0.99207 Exch. Na^++0.10372 C.E.C.-0.99247 Exch. Mg^(++)+0.04933 Base Sat. +1.69389 Exch. K^+-0.45251 Exch. Ca^(++)+0.57219 pH +0.00432 Avail. P₂O_5+0.02973 Clay+0.00790 Sand(R²= 0.9628). viii) B horizon in soil of P. densijlora for erecta stand : S .I.=0.29011-3.90268 Exch. K^+ +1. 70610 pH+0.19143 C.E.C.-0.35469 O.M.-2.17588 Exch. Mg^(++)+0.05697 Base Sat. - 4.19391 T.N.-0.00906 Avail. P₂O_5+1.26565 Exch. Na^+-0.00621 Sand-0.39144 Exch. Ca^(++)(R²= 0.9645). VI. Soil pH and T.N. of the physico-chemical properties in soil turned out to be positively related to the site index. However. O.M. and Avail. P₂O_5 in soil were found out negativly related. VII. In the degree of contribution of the variables to site index by each one of the stands, the highly effective variables were found out as follows ; i) In A horizon in soil of P. koraiensis stand Exch. Ca^(++), O.M.. Clay, T.N., and San