Abstract: In this eater,the measuring and estimating methods of frequently used param eters(such as specific yield,coefficient of recharge from precipitation and coefficient of phreatic evapaolration) in shallow groundwater resources assessment are described and it is dissected by practical examples.Through analysis,weobtain some new knowledge,that is:(1)The value of specific yield is related to the conditions of injected and released water.In the practical situation,the maximum value of specific yield may occur around the ground surface since the surface soil of farm land is loo se and is effected by cro ps.(2) By using the pumping test technique to measure the specific yield,its value is varied from well to well,we adopt the mean value of it in the domain of mainly affected radius and this is a new attempt;(3) The coefficient of recharge from precipitation is not only related to the construction of soil but also related intimately to specific yield and its regular pattern of distribution is decided by the size of specific yield.Generally,there is a tendency that the coefficient decreases with increasing depth from ground surface to water level;(4) The coefficient of phreatic evaporation varies according to different seasons and croes and the parameters in the calculating formula varied as well.