Objective: Currently, the conventional static postural-control assessments use linear CoP metrics, whose validity is questionable; nonlinear measures may detect changes more sensitively. This study compares linear and nonlinear CoP analyses for distinguishing declines in postural control caused by reduced plantar sensation. Methods: Twenty-seven healthy college students were recruited (female=5, male=22, age=21.67±1.59 years, height=172.7±7.8 cm, body mass=68.9±10.9 kg). their plantar tactile sensation was reduced via ice immersion, thereby impairing static postural control. Static postural control was measured during double-legged and single-legged standing for 60s . The linear variables like CoP displacement, CoP velocity and CoP ellipse area were calculated. Nonlinear CoP metrics were computed using sample entropy. Paired-sample t-tests were used to compare the static postural control before and after ice. Results: Plantar tactile sensation threshold (pre-ice: 2.75±0.25 gauge, post-ice: 4.03±0.29 gauge, p<0.001, d=4.73) significantly increased after ice immersion. During the double legged standing test, the sample entropy of CoPAP (pre-ice: 0.12±0.08 mm, post-ice: 0.06±0.03 mm, p=0.005, d=0.99)and CoPML (pre-ice: 0.27±0.22 mm, post-ice: 0.03±0.01 mm, p<0.001, d=1.54) significantly decreased after ice immersion; During the single legged standing test, the sample entropy of CoPAP (pre-ice: 0.06±0.03 mm, post-ice: 0.02±0.01 mm, p<0.001, d=1.79) and CoPML (pre-ice: 0.08±0.04 mm, post-ice: 0.02±0.01 mm, p<0.001, d=2.06) significantly decreased after ice immersion. Conclusion: Compared to linear analysis, nonlinear analysis of CoP is more sensitive in assessing static postural control induced by reduced plantar tactile sensation. It is suggested that future studies use CoP nonlinear analysis to assess static postural control.