A novel Belousov-Zhabotinskii(BZ) type oscillating reaction was observed in a closed serine(Ser)-BrO^-~3-Mn^2^+- H2SO4 system(Ser-BZ system), which exhibited the followign characteristics: (1)Although Ser is unable to be brominated, the sustained oscillations could still be observed in the above system under batchreactor conditions even in the absence of either acetone or inert gas flow. (2)The present oscillations displayed extremely short induction period(0) and very few oscillation number(<11). (3)Cl^-, acrylonitrile, or Br^- could effectively inhibit the oscillations. However, in the case when enough Ag^+ was addedinto the system to completely inhibit the oscillations in [Br^-], the oscillations on the Pt-electrode could still be observed. Based on the above oscillation characteristics and the product analysis, it was concluded that the present oscillations in Ser-BZ system may be radical-controlled rather than Br^-- controlled. Addition of suitable amount of acetone could induce the sequential oscillatinos owign to the coexistence of these two types of controlling models. According to the kinetic studies on the reactions of Mn^3^+-Ser and BrO^-~3-Mn^2^+, together with the FKN mechanism, the oscillating mechanism in the present system was discussed briefly.

Key words: SERINE, BORATES, REACTION MECHANISM, DYNAMICS, FREE RADICAL REACTION, OSCILLATION CHEMICAL REACTION