The value of 2P(r) (twice the polarization at zero electric field) in the five-layered Aurivillus film Bi6Fe2Ti3O18 is greater than 50 mu C cm(-2), which is almost an order of magnitude higher than that of the bulk (4 mu C cm(-2)). Moreover, the well-defined hysteresis loop of this film can persist at the measurement frequency of 100 kHz, indicating the ultra-fast switching speed of such a domain. The frequency dependence of the coercive field obeys a power-law form, E-c(f) = sf(d/a), indicating that its domain switching kinetics are influenced by the motion of the domain wall. The polarization of the Bi6Fe2Ti3O18 thin film remains essentially constant at a waiting time of up to 2 x 10(4) s, and is independent of the applied electric field. The switchable polarization loss is 32% after 9 x 10(10) read/write switching cycles at a frequency of 1 MHz. This change in the switchable polarization is discussed in terms of the aggregation of oxygen vacancies in the film.