Chlorinated paraffins (CPs) are popular and high-volume-production industrial chemicals.Among the 18 wildlife species, the highest concentrations of CPs were found in moose (muscle) (Yuan et al. 2019), which is in line with a monitoring study on the same area by Jansson et al. (1993) 25 years ago.In this project, very-short-chain (vSCCP), short-chain (SCCP), medium-chain (MCCP), and long-chain(LCCP) chlorinated paraffins have been comprehensively analyzed for studying (1) temporal trend of CPs between 1981 and 2018 in moose from the same sampling site (Grimsö, Västmanland) and (2) the individual, sex, and age variances of CP accumulation in moose.The peak concentration of the legacy SCCPs was 280 ng/g lipid in the year 1993.The peak concentrations of LCCPs were found at the year 1989 and 1993 (73 and 63 ng/g lipid, respectively). This is generally in line with the sediment core records collected from Himmerfjärden and from Rundvik coasts (Yuan et al. 2017), which could reflect the peak importation of CPs.