The main objective of this project is to study distribution and concentration of selenium (Se) and its affecting factors in Hong Kong soils.Soil samples were collected from fifty-one soil profiles and 44 surface soil layers at 44 sampling sites throughout Hong Kong for analysis of total Se with the aid of the induct ively coupled plasma spectrophotometry.The results indicate that Se was mainly distributed in B and C horizon.Concentrations of total Se in all the soil samples ranged from 0.07 mg kg^-1 to 2.26 mg kg^-1 (dry wt.), with the lowest and highest concentrat ions recorded in Orthic Anthrosols (average 0.45 mg kg^-1, dry wt.) and Udic Ferralisols (average 1.05 mg kg^-1, dry wt.) respectively.In terms of land use, the highest and lowest concentrations were recorded in forest soil (average 1.36 mg kg^-1, dry wt.), and agricultural soil (average 0.36 mg kg^-1, dry wt.) respect ively.The main factor that influences Se concentration and distribution in Hong Kong soils was the parent material.Other soil factors such as soil pH, organic matter, clay fraction, iron and aluminum also played relatively important roles.