The requirements for interpolation of scattered data are high accuracy and high effi- ciency. In this paper, a piecewise bivariate Hermite interpolant satisfying these require- ments is proposed. We rstly construct a triangulation mesh using the given scattered point set. Based on this mesh, the computational point (x; y) is divided into two types of interior point and exterior point. The value of Hermite interpolation polynomial on a triangle will be used as the approximate value if point (x; y) is an interior point, while the value of a Hermite interpolation function with the form of weighted combination will be used if it is an exterior point. Hermite interpolation needs the rst order derivatives of the interpolated function which is not directly given in scatted data, so this paper also gives the approximate derivative at every scatted point using local radial basis function interpolation. And numerical tests indicate that the proposed piecewise bivariate Hermite interpolations are economic and have good approximation capacity.