QCD CORRECTION TO SIGMA(E(-)-]ZH-]ZB(B)OVER-BAR)()E()

We study the QCD corrections to the calculated values of sigma(e(+) e( -) --> ZH --> ZB (b) over bar), and find that for M-H < 100 GeV, the p rocess can be measured at the LEP energy to extract information of Hig gs and the QCD corrections are negligible, namely the tree-level calcu lation is sufficiently accurate for the energy range, while for M-H > 100 GeV the Higgs-involved subprocess can only be investigated at NLC, and then the QCD correction becomes as large as 45%. For M-H > 2m(t), considering the subprocess e(+)e(-) --> ZH --> Zt (t) over bar, the Q CD corrections are also important and must be taken into account for t he cross section evaluation.