Accurate determination of 79Se level in environmental samples is critical for evaluating radioactive contamination risk. A new pretreatment method for 79Se determination by inductively coupled plasma-mass spectrometry (ICP-MS) through solid phase microextraction (SPME) - dielectric barrier discharge vapor generation (DBDVG) - ammonia water absorption-evaporation (AAE) was proposed in this work. The sorbent of nano-ZrO2 was used in SPME, which could both enrich Se and selectively adsorb Se from Br, which has an identical mass of 79 to 79Se. DBDVG was used to reduce the species of Se from Se(IV) or Se(VI) to volatile H2Se vapor to eliminate the sample matrix interferences. Ammonia water was used to absorb the volatile H2Se and then evaporated to enrich Se. The adsorption, DBDVG and absorption parameters were optimized in detail. The mass interference of 38Ar40ArH+ was effectively eliminated by the addition of He gas in the collision/reaction cell, and the other potential interferences of 39K40Ar+, 63Cu16O+, 158Gd2+, 158Dy2+ and 78SeH+ were all not obvious in this method. The detection limit of 79Se was 10.1 ng L-1 and the inter-batch reproducibility between different SPME tubes was 1.9 %. The concentration of 79Se in environmental samples such as lake water and plant leaves were assessed. Compared with conventional ion exchange resin methods for enrichment of 79Se, our SPME approach achieves desorption via DBD plasma without the need of acidic or alkaline reagent for elution. In contrast to conventional ICP-MS sample introduction methods for ??Se determination, such as hydride generation and electrothermal vaporization, the proposed DBDVG technique drives redox reactions entirely via free radicals and electrons generated in the discharge plasma. This design fully eliminates the need for additional redox reagents or chemical modifiers, and thus drastically lowers the associated reagent blank levels.