Citrus pectin with four different degree of esterification(82.32%,75.57%,64.56%,55.88%) were prepared,then their adsorption effect and mechanism towards lead were studied.It was found that all the pectins showed good adsorption when the solution temperature was 30 ℃ and pH was 5.0.It indicated that high esterified pectin had good effect on the adsorption.Citrus pectin with different degree of esterification could adsorb lead at a fast rate,they almost achieved adsorption equilibrium after 40 minutes.Various...