Abstract:The residual contents of organochlorine pesticide (OCPs) in rhizoma corydalis of different provenances and in soils collected from the experimental bases in Wanzhou and Kaixian of Chongqing were determined by gas chromatography with electron capture detector (GC-ECD), and the residual characteristics and ecological security of OCPs were also analyzed. The results showed that:1) DDTs and HCHs were detected both in soils and in rhizoma corydalis with the detection rates of 100% and 83.3% for DDTs, and of 72.2% and 100% for HCHs, respectively. The residual quantities of DDTs and HCHs had greater discreteness and inter-regional differences. 2) In soil samples, 4,4'-DDE and α-HCH had higher detection rates, which were 100% and 66.7%, respectively. 4,4'-DDE and α-HCH were the main components of OCPs’ residue. 3) In the rhizoma corydalis samples, α-HCH, 4,4'-DDE and β-HCH were detected, the detection rates were 100%, 77.8% and 55.6%, respectively. The three components accounted for 73.7% of OCPs’ residue. Rhizoma corydalis had a strong bioconcentration on α-HCH and 4,4'-DDE, enrichment factors was about 1.8 and 0.65, respectively. OCPs’ residue in experimental base was in line with the requirements of the 2nd standard of Environmental Quality Standard for Soils, which was in the safe level. OCPs’ residue in rhizoma corydalis was in line with the requirements of Green Standards of Medicinal Plants and Preparations for Foreign Trade and Economy.