Abstract: Between the soil moisture characteristic curve expression holard energy and quantity relations, study the response holard basic characteristic curve which the soil moisture the maintenance and the movement use.It is studies the non-saturated layer moisture content migration and the transformed foundation.In the moisture content characteristic curve negative pressure and the moisture content relations is extremely complex, theoretically infers the accurate relationship with difficulty, the usual people carry on the description with the empirical formula to it, therefore selects appropriate earth water characteristic curve empirical formula watershed.This article to had the representative six kind of empirical formula model to carry on the fitting to the measured data, obtained Mckee and Bumb (1984) model is suits the description sandy soil moisture content characteristic curve the empirical formula.