Determination of parameters of Higgs sector in the minimal supersymmetric Standard Model

We examine whether parameters related to Higgs sector of the minimal supersymmetric standard model can be determined by detailed study of production cross section and decay branching ratios of the Higgs boson. Assuming that only the light Higgs boson is observed at a future $e^+e^-$ linear collider with $\sqrt{s}=300\sim500$GeV, we show that values of $m_{susy}$ and $\tan\beta$ are restricted within a narrow limits in the $m_{susy}$ versus $\tan\beta$ plane by the combined analysis of the light Higgs properties. It is also pointed out that, in some case, the value of $\tb$ may be restricted within a relatively low value, $\tb=1\sim5$.