The diffusion field with a competitive-consecutive reaction(A+B→R, R+B→S)in a turbulent liquid jet has been experimentally investigated. The water solution of species B and non-reactive dye Y is issued into the main flow including species A. The instantaneous concentrations of two reactive species(R and S)and a non-reactive dye(Y)were measured simultaneously by the light absorption spectrometric method. The instantaneous concentrations of species A and B were determined by the conserved scalar theory. Since the reaction rate constant of the primary reaction is much larger than that of the secondary reaction, the species R starts to be produced efficiently from the neighborhood of the nozzle exit, while the species S is mainly produced in the downstream region. The skewness of the concentration PDF of reactants A and B on the jet axis show the positive values in the downstream region, while those products R and S show the negative values.