Objective To study the difference in the prevalence of conjunctivochalasis (CCh)when using two different diagnostic and inclusion standards.Methods It was a cross-sectional study.The prevalence of CCh based on the diagnostic standards of H(o)h and Zhang was conducted in people over 60 years of age in Shanghai's CaoYangXinCun community.The people underwent interview and ocular examination.Pre- test was maded before formal investigation,and the quality of investigations was guaranteed.Data were analyzed using an independent samples t test and a chi-square test.Results Two hundred and forty-six people (492 eyes) were included in this study.One hundred and ninety-three cases (377 eyes) (78.4％) were diagnosed with CCh using the H(o)h's standard,whereas 96 cases (191 eyes) (39.0％) were diagnosed using the Zhang standard.When they were subdivided into different age groups,60-65,66-70,71-75,76-80,and over 80 years of age,the respective prevalences of CCh with H(o)h's standard were 69.3％,72.1％,76.0％,82.1％,89.3％ and 100％ while respective prevalences were 31.6％, 36.5％,42.3％,42.9％ and 44.6％ with Zhang's standard.There was a statistical difference in the prevalence of CCh with the two standards (x2=78.91,P＜0.01).Despite the difference,the prevalence of CCh with both standards increased with age.Conclusion The prevalence of CCh with H(o)h's standard is higher than that with Zhang's yet it is also reasonable to use Zhang's standard to diagnose CCh.