AIM:To evaluate effect of ciliary body shape and position on spatial structure in anterior segment of normal eyes. METHODS:Totally 186 eyes of 186 normal subjects were examined by ultrasound biomicroscopy(UBM), A scan and Pentacam scheimpflug system, including ciliary body thickness(CBT), ciliary process length(CPL) , scleral ciliary process angle(θ) ,anterior chamber volume(ACV), anterior chamber depth(ACD), lens thickness(LT) and relative lens position(RLP), angle opening distance 500μm from the scleral spur(AOD500). The correlations of CBT, CPL, θ and ACV, ACD, LT, RLP, AOD500 were analysed using linear correlation and regression analysis. RESULTS:Normal CBT, CPL, θ and ACV, ACD, LT, RLP, AOD500 were 0.740±0.099mm, 1.228±0.166mm, 45.81°± 5.11°, 171.15±44.23mm3, 2.822±0.314mm, 4.29±0.48mm, 0.231 ± 0.013,0.373±0.069mm, respectively.CBT was positive correlation with ACV, ACD and RLP, negative correlation with LT and no correlation with AOD500. CPL was negative correlation with ACV, ACD, RLP and AOD500, positive correlation with LT. θ was positive correlation with ACV, ACD,RLP and AOD500 and no correlation with LT. CONCLUSION:Ciliary body shape and position are influence factors of differences in spatial structure of ocular anterior segment.