U sin g th e m ean m onthly runoff a t the 3 hydrology sta tio n s from 1954 to 2 0 0 8 as w ell as th e p re c ip ita tio n an d te m p e ra - tu re se ries at th e 2 m eteorology statio n s from 1951 to 2 0 0 8 in th e d o w n stream of th e Jin s h a jia n g R iv e r a n d T h ree G orges R ea ch , th is p a p e r in v estig a te d th e c h a n g e te n d e n c y of h y drological a n d m eteoro log ical facto rs w ith m oving av erag e m e th o d a n d M a n n - K en d all ran k co rrelatio n te st, a n d ex a m in e d th e m u tab ility a n d p erio d icity w ith se q u e n tia l c lu ste rin g a n a ly sis, m ean v a lu e test m eth o d a n d w avelet an a ly sis. In ad d itio n , th e sen sitiv ity o f ru n o ff to p re c ip ita tio n an d te m p e ra tu re c h a n g e w as an aly zed . T h e re su lts show that: (1) In n e r—a n n u a l d istrib u tio n a n d in te r—a n n u a l v ariatio n of ru n o ff in the stud y a r e a is n o t sig n ifica n t. (2) T h e ru no ff at th e P in g sh an S tation in th e do w n stream o f the Jin s h a jia n g R iv er in d ic a te s an u p tren d and a n a b ru p t c h a n g e in 1 997, m ean w h ile, th e p recip itatio n at th e Y ib in S tatio n reflects th e o p po site tre n d w ith a m u tatio n p o in t in 1 9 9 1 . Sim ilarly , th e a n n u a l ru n o ff at th e hydrology statio n s in th e T h ree G orges R e a c h p re se n ts a d o w n tren d a n d ab ru p t ch a n g es in 1 968 a n d 2 0 0 5 , w hile th e p re c ip ita tio n at the S h ap in g b a S tatio n show s an in c re a sin g tre n d w ith ob vio usly m u tatio n p o in ts in 1961 a n d 1995. (3) S e rie s o f ru n o ff a n d p re - cip itatio n all show m ain c y c le s le ss lhan 10 y ea rs a n d seco n d ary cy c les over 2 0 y ears. (4) R unoff in su m m er is jo in tly in flu e n c e d b y p recip itatio n an d te m p e ra tu re in the co rresp o n d in g p erio d , a n d foreg oin g tem p era tu re m ostly im p acts ru no ff in au tu m n