Abstract: Organophosphate esters (OPEs) are widely used as flame retardant, defoamer and plasticizer additives with low cost in many industrial production procedures. OPEs may penetrate into the environment via their production, usage and waste disposal. The sea is a sink of pollutants, and the occurrence, distribution characteristics and ecological risks of OPEs in the marine environment require particular attentions. In this study, 29 kinds of OPEs including 15 emerging OPEs (eOPEs) in sediments from Liaodong Bay were determined by ultra-high performance liquid chromatography combined with triple quadrupole mass spectrometry. Total concentration of OPEs in Liaodong Bay sediments ranges from 4.76 to 24.88 ng/g, of which eOPEs exhibited small contributions with concentrations of 0.020-2.605 ng/g. A preliminary risk assessment was conducted using the OPE concentrations in the sediment samples and reported toxicological thresholds. The risk quotient (RQ) of tris(2-chloroethyl) phosphate (TCEP) was relatively high with maximum value of 0.52, indicating medium risk to benthos. The RQ values for. tris(1-chloro-2-propyl) phosphate (TCIPP), tri-p-cresyl phosphate (T4MPP), tri-n-butyl phosphate (TNBP), triethyl phosphate (TEP), tri-m-cresyl phosphate (T3MPP) and cresyl diphenyl phosphate (CDPP) in all or part of sediment samples were higher than 0.01, which were the low risk. According to source analysis, the potential sources of OPEs are mainly nearby Industrial discharge nearby, surface runoff and atmospheric deposition were indicated to be the potential sources of OPEs according to correlation analysis and principal component analysis.