With data in 2004 from Digisonde at Acsension IS station (7.9°S, 345.6°E; Magnetic 2.3°S) in the low latitude region of Atlantic Ocean in the Southern Hemisphere, the occurrence features of spread F, especially strong range spread F, were statistically studied. The results showed: the types of spread F observed were frequency spread F (FSF), range spread F (RSF), strong range spread F (SSF) and Mixed spread F (MSF), no branch spread F. The Monthly variation of each type of spread F was different, the occurrences of RSF and SSF were higher from January to March and from October to December, and decreased from May to August, while the occurrence of SSF was still high in July and September. The percentage of duration for SSF was high in summer and equinoxes (near 30%), and low in winter (5%). The order of the peak occurrence local time were RSF, SSF, FSF and MSF. Compared with results at other stations, it showed that the seasonal variation of the spread F (especially SSF) occurrence was not the same to features at other longitude stations, indicating the regional features of ionospheric phenomenon, implying the SSF should be considered as an independent type of spread F to be studied.