Abstract: 
We show the local wellposedness of plasmavacuum interface problem for \emph{ideal incompressible} magnetohydrodynamics under the stability condition that the magnetic field $\mathbf{h}$ and the vacuum magnetic field $\hat{\mathbf{h}}$ are noncollinear on the free interface(i.e., $\mathbf{h}\times \hat{\mathbf{h}}>0$). Such a stability condition was first proposed by Y. Trakhinin for the \emph{compressible} plasmavacuum interface problem. 
