(2) the concentration of Ni and Cd in experimental soil increased with the additive amount of composted sludge, and the concentrations of heavy metals Ni and Cd in composted sludge were within the limited concentrations set by GB4284-84. after planting, a majority of heavy metals was accumulated in the experimental soil, and the accumulation coefficient was in range of 0.58-0.89. meanwhile, the absorptions of Ni and Cd were both low, with the absorption coefficients ranged respectively between 0.02-0.17 and 0.02-0.12. It can be seen that the application of complete sludge in loess will not endanger human beings in short term under the controlled condition. but a complete application, administration, detection and monitoring system is required to be established for the long term application, so as to prevent heavy metals from polluting surrounding environments.