Abstract: By using the methods of field investigation and soaking extraction, the waterholding properties of litter layer of Sapindus mukorossi plantation with different age class were investigated,and the regression relationship between the waterholding properties and soaking time,water uptake rate and soaking time was build.The results showed that: the waterholding properties of litter layer of Sapindus mukorossi plantation with different age class existed significant differences.There was a polynomial regression relationship between the waterholding properties and the age class.The class I of Sapindus mukorossi plantation had the best waterholding properties.The natural water holding capacity,natural water holding rate,the maximum of waterholding content,the maximum of waterholding rate,the biggest net capacity were all the highest.The waterholding capacity in Sapindus mukorossi plantation with different age class increased in the form of logarithmic functional model with the increase of soaking time, with the correlation coefficient from 09124to 09194.The waterabsorption rates of the litters decreased in the form of power function,with the correlation coefficient between 09860 and 09875.The waterabsorption rates became lower with the increase of soaking time.The waterabsorption rate was 19525g/h while soaking in the water for 1h.It reduced to 10981g/h while soaking in the water for 2h.After 20h,the waterabsorption rates became zero.