Abstract: Through the analysis of agro-ecosystem in Gansu Province, the evaluation indices, criteria, and comprehensive model for agro-ecosystem health were built, and AHP method was used to analyze the status of agro-ecosystem health in this Province. The results showed that the agro-ecosystem health status was relatively better in partial regions of Gansu Province, e.g., Longnan, Linxia and Gannan, but at a lower level in other regions. The values of natural environmental factors related to the system structure of this Province were lower, especially in some districts of Hexi arid area whose system structure value was less than 2. Other regions except Baiyin district had a little difference in system structure value (higher than 2), and the values in Longnan and Gannan regions were relatively higher. From the viewpoint of economy, the economic indices values of Hexi arid area were higher than other regions in Gansu Province.

Key words: Red soil, Cu, Chelate, Speciation, Brassica juncea, Remediation