The pot experiments were carried out to study the effects of different amounts of biochar-based composites ( MPC-BC ) ( mass ratio of 1 %， 3 %， 5 %， marking as T1， T2， T3， respectively) on soil physicochemical characteristics， forms transformation of cadmium ( Cd )， Chinese cabbage growth， physicochemical characteristics and Cd absorption by plant. The results showed that the application of MPC-BC significantly promoted the growth of Chinese cabbage under Cd stress. Compared with CK (without MPC-BC applicaion)， the plant height， aboveground and underground biomass of Chinese cabbage increased significantly， and those in T3 treatment increased the most， which was 78.11%， 137.72% and 60.64% higher than that of CK， respectively. With the increased application of MPC-BC， the activities of superoxide dismutase ( SOD )， peroxidase ( POD ) and catalase ( CAT ) were increased first and then decreased， and the content of malondialdehyde ( MDA ) were decreased significantly. The activities of SOD， POD and CAT in Chinese cabbage leaves were the highest under T2 treatment. The absorptive capacity of Cd by Chinese cabbage decreased with the increased application of MPC-BC. Under the condition of applying MPC-BC， The soil pH was decreased by 0.13-0.42 pH unit， soil electrical conductivity was increased by 6.92%-137.6%， soil total nitrogen， available potassium， organic matter content and cation exchange capacity were increased， and soil available phosphorus was content decreased. The application of MPC-BC reduced the content of available Cd in soil， and the weak acid extractable Cd and reducible Cd were transformed into residual Cd. Therefore， the composite material can effectively fix Cd in contaminated soil and alleviate the damage of Cd stress to crops. Under the conditions of this experiment， the application of 3 % has the best remediation effect.