  The Feynman amplitudes of light-cone gauge superstring field theory suffer
from various divergences. In order to regularize them, we study the theory in
linear dilaton background $\Phi =-iQX^1$ with the number of spacetime
dimensions fixed. We show that the theory with the Feynman
$i\varepsilon\,(\varepsilon>0)$ and $Q^{2}>10$ yields finite results.
