  In this paper we perform the calculation of the gravitational scattering
amplitude for 4 massless scalars in quantum field theory and Type II
superstring theory. We show that the results agree, providing an example of how
gravity is incorporated in the superstring theory. During the calculation we
quantize gravitational action to derive graviton propagator and interaction
vertex with massless scalar. We also calculate general 3-point and 4-point
scattering amplitudes in SST for open and closed massless strings in NS sector.
