It has been known from studying on 37 forest types that the water storing level of forest in Hunan province is very low .The average total quantity of water storing is 4102.9 t/hm2

and the effective quantity of it is 830.2t/hm2; The largest effective quantity of water storing in natural forest

artificial forest and ecological forest of simulating natural reaches 1049.7 t/hm2

534.5t/hm2 and 764.0 t/hm2 respectively. The largest effective quantity of water storing of natural forest

middle-age forest and young growth forest of natural forest reaches 1285.1/hm2

1065.4/ hm2and 798. 5 t/hm2 respectively;The 3 ages classifacation of artificial forest are 642.5t/hm2

563.0 t/hm2 and 534.5 t/hm2. The techniques for water preserving capability improving in forest land were advanced acxeording the low quality and its low function of water storing.