This thesis is done by carrying experiments on the Lien-hua-chi watershed. We evaluate the infiltration capacity in the different covers of the forestland. Furthermore, attempts are also made to search for the relation between the macropores of the forest land and the water storage capacity (pF-2.54) of forest land in order to estimate the quantitative effect of conserving the water resources by the forest land efficiently. The results obtained from the analysis of these experiments are summarized as follows: 1. The average final infiltration rate of the different plots from the largest to the smallest are in the following: the logged area>Taiwan Incense- cedar 60 yrs.>China fir 20yrs.>natural hardwood forest> Taiwan Incense-cedar 30 yrs.>China fir 10 yrs.>China fir 3 yrs.>Taiwan Incense-cedar 5 yrs.>the bare land. 2. There is a more significant correlation of the final infiltration to the macropores of the soil than that to its total porosity, and thus the relation between amount of macropores and water storage capacity can be serve as an index which indicates the effect of water storage capacity of the soil.