Urban parks are important leisure places for citizens and indispensable part of urban environment, the environmental quality of which have important influence on human lives and health. This paper studied the residues and enantiomeric signature of typical organochlorine pesticides (HCHs and DDTs, et al) in urban pine needle, earthworm and soil in Beijing combined with chiral/non-chiral column gas chromatography-electron capture detector (GC-ECD) and gas-mass (GC-LRMS). The aim of this study was to p...