Objective To study the characteristics of choroidal circulation in RP. Methods Using ICGA to obse rve 37 cases of RP and compare with healthy volunteers. Results ① The earliest fluorescein filling time of the choroidal arteries in RP group was (14.38plusmn;3.95) seconds,the choroidal veinous in RP group was (17.27plusmn;5.94) seconds,and there was no obvious difference between RP and control group.②The fluorescein failing time of choroidal vein in RP group was (475.75 plusmn;153.70)seconds.③The area of the bright fluorenscence in posterior fundus in RP group was (41.20plusmn;19.99) mm2,and compared with the control group,there was significant difference (P＜0.0001). ④In the mid to late phase during ICGA，in RP group the veillike hypofluorescence was found in 61 e yes (84.7%),plaque hyperfluorescence in posterior fundus in 21 eyes (29.2%),and leakage of heperfluorescence in 4 eyes(5.6%). Conclusion ①The perfusion pressure of choroidal vessels in RP reveals no c hange.②The blood volume of choroidal vessels becomes decreased in RP.③The choroidal capillaries become atrophic in RP.④Choroidal neovascularization may occur in patients with RP. (Chin J Ocul Fundus Dis, 2001,17:26-29)