  We study the generation of the primordial curvature perturbation in
multi-field inflation. Considering both the evolution of the perturbation
during inflation and the effects generated at the end of inflation, we present
a general formula for the curvature perturbation. We provide the analytic
expressions of the power spectrum, spectral tilt and non-Gaussianity for the
separable potentials of two inflaton scalars, and apply them to some specific
models.
