The increasing rhythm of pore-water pressure and cyclic softening behavior is discussed by tests on saturated compacted loess. The results indicate that saturated compacted loess can liquefies subjected to dynamic loads, the curve of pore-water pressure of it is similar to that of initial loess, and it displays softening nature subjected to cyclic loads. In engineering, reconstituted loess, if it is saturated or almost saturated, can liquefies and deforms strongly.