【Objective】Cadmium (Cd) is a harmful element to the human body and can cause many serious diseases. At present, many soils are faced with serious Cd contamination. For example, the soil in Yunnan Province highly polluted by Cd, and necessary steps need to be taken to remedy this situation. The application of biochar to soils is a common way to remedy soil Cd contamination, therefore, this research is designed to study the properties of biochar from different plant sources and evaluate their application effect on Cd pollution in the Dongchuan area, Yunnan Province. 【Method】The isothermal adsorption-desorption and adsorption kinetic characteristics of rice straw biochar (RBC), wheat straw biochar (WBC), corn straw biochar (MBC), hemp straw biochar (HBC), sesbania biochar (TBC) and peanut shell biochar (PBC) were studied; Through pot experiments, the effects of the above biochar on Cd fraction in Cd-contaminated soil and Cd uptake by Lactuca sativa L. in Dongchuan were analyzed. 【Result】Fitting results of adsorption models showed that Langmuir adsorption isotherm and the pseudo-second-order model could better simulate the adsorption process of Cd by biochar. TBC’s maximum saturated adsorption capacity was the highest, 37.1 mg·g^-1 in the isothermal adsorption model and 27.9 mg·g^-1 in the adsorption kinetic model, respectively. The desorption rates of WBC, RBC and TBC were lower than those of MBC, HBC and PBC, and no more than 10% under each concentration gradient. Fourier transform infrared spectroscopy (FTIR) analysis showed that TBC contained more oxygen-containing functional groups (OH-, C=O etc.). Also, the XRD analysis showed the biochars were mainly composed of C and Si elements, while different biochars also had some different elements (e.g. Fe, Mn etc.). Compared with the treatment without biochar (CK), WBC, MBC, HBC, TBC and PBC treatments significantly reduced the content of soil available Cd. Among them, the maximum decrease was observed for TBC (24.32%). At the same time, the Cd fraction changed from an acid soluble state to a reducible state, oxidizable state and residual state. Compared with the treatment without biochar, WBC, MBC, HBC and TBC treatments significantly reduced the Cd content in the aboveground parts of Lactuca sativa L. (P<0.05), and the maximum decrease occurred in HBC (26.40%). In addition, WBC and HBC treatments significantly reduced the translocation factors of Cd in Lactuca sativa L., which were 0.662 0 and 0.692 8 respectively. The results of ABT (aggregated promoted tree) analysis showed that soil soluble organic carbon (DOC) and soil pH were the main influencing factors of soil available Cd, with a significant negative correlation, and the contribution rates were 33.0% and 21.9% respectively. 【Conclusion】In conclusion, all the biochars from different plant sources can reduce the availability of Cd in Cd-contaminated soil in Dongchuan, change the Cd fraction in soil, and reduce the absorption and transport of Cd by plants. There are differences between different biochars. Moreover, TBC can be selected to remedy Cd-contaminated soil in the Dongchuan area through the results of the isothermal adsorption test, adsorption kinetics test and pot experiments.