The temporal/spatial varition features of Fujian drought/flood for the past 500 years are studied by means of FFT,continuous wavelet (CWT) and orthogonal wavelet transformation (OWT).The analysis show that:1)there are significant 2~3 years and 10 years periodic signals in the drought/flood grade series of Fujian,but there are spatial/temporal variations for other periods;2)on the centurial scale,the past 500 years can be divided into 6 dry/moist phases and currently it is in a dry to moist transition period in the northern region,whereas in the eastern and southern areas the past 500 years can be divided into 5 spells and now it’s still in the dry period,on the decadal scale,the past 500 years can be divided into 4 dry/moist periods and now Fujian is in a moist period;3)in northern regions,the grades series had a weak positive (dring) trend in the period from the end of the 16th century to the beginning of the 20th century and a negative trend in the 20th centry,and in the eastern region the grade series showed a weak decreasing (wetting) trend before the 20th century and an increasing (drying) trend in the first period of the 20th century,whereas the grade series had no obvious trend in the southern region.The variance contribution percentages of interannual,interdecadal and centurial changes to the three subregions’ drought/flood grade variations are >80%,<15% and <5% respectively.