This paper . using potentiometric method, first reports the oscillating behavior of the system of L-lysine--BrO3^- Mn^2+- H2SO4-acetone. According to experimental results and FKN mechanism, the mechanism of the B-Z type oscillating reaction using lysine as organic substrate has been explored which can explain experimental phenomena suceussfully .The relationships of the oscillatory induction period (tin) and the oscillation period (tp) of the system to the initlal concentration of reactants are obtained .The B-Z type oscillating reaction using lysine and acetone as mixed organic substrates has not yet been investigated.
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