In this paper, changes and trends in rainfall were analyzed looking at annual average rainfall, number of days with rainfall or = 50 mm and number of days with rainfall or = 100 mm that were recorded at 13 observation stations and rain stations from 1981 to 2010 in Quang Nam province. The results show that average annual rainfall changes dramatically. The average annual rainfall decreases from 1981 to 1990 and increases dramatically from 1991 to 2010. In general, average annual rainfall in Quang Nam increases over the whole period. The number of days with rainfall or = 50 mm and the number of days with rainfall or = 100 mm increased. Changes in rainfall patterns played an important role in increases landslides in Quang Nam.