Tea is one of the most important economic crops in China and the relevant research suggests that every year, Pb content in tea products has shown an increasing trend. Pb is also one of the most important indicators of quality and safety monitoring. Recent, research mostly focused on the resistance of plants to heavy metals was limited to short growing herbs. Reports on the study of woody plants are very rare. On the basis of these conditions tea tree was selected as research work. The objective of the present study is to find out the molecular mechanism of Pb stress resistance in roots CW of tea plants.Tea trees grown in the clean tea garden were selected for our experimental design. Tea roots were collected and washed with deionized water. Then extraction of crude CW and subsequent fractionation of CW components were carried out. Adsorption kinetics was carried out to determine the adsorption ability of different CW components to Pb stress. A total of 5 mg of CW materials or its corresponding residues was placed into a 2-ml column equipped with a filter at the bottom.The solution consisted of 15 μmol/L Pb(NO₃)₂ in 0.01 mol/L NaNO₃ at pH 5.0.The solution was sipped by a peristaltic pump set a speed of 8 ml per 10 min after running through a 2-ml column holding the CW samples. The adsorption solutions were collected at 10-min intervals and Pb in the adsorption solutions was measured by Atomic Absorption Spectroscopy (AAS). At last the Fourier Transform infrared spectroscopy (FTIR) spectra of different CW components before and after Pb²⁺ adsorption was carried out to study the difference in functional groups those can interact with Pb between different CW components.The results of this study shown that the vast majority of Pb (68.42%) adsorbed in the cellulose and lignin,followed by pectin (20%) and hemicellulose2 (HC2) (5.26%).While, the contribution of HC1 was negligible. These results indicated that in the CW of roots cellulose and lignin has a greater ability to accumulate Pb as compared to pectin, HC1 and HC2. But the adsorption capacity of pectin was also very considerable. According to the FTIR spectra of CW-pectin-HC1-HC2 (CW-3) before and after Pb²⁺ adsorption it was found that although the cellulose and lignin contain a mass of -OH and -COOH, when they adsorbed Pb, their characteristic peaks' positions had no obvious changes. However, the positions of characteristic peaks' of C-C in cellulose polysaccharide and N-N in protein amino changed significantly, but these didn't appear at the complete CW. In summary, it was found that when CW adsorbed Pb all these functional groups in cellulose and lignin had hardly interacted with Pb. However, it was different in pectin, HC1 and HC2. For instance in pectin, when CW adsorbed Pb, -OH and -COOH characteristic peaks' positions changed significantly. It can be indicated that Pb was fixed through interactions with functional groups like -OH and -COOH in pectin. The same approach had yielded the main functional groups in HC1 and HC2 was -COOH and -OH respectively.