  We evaluate the sphere level S-matrix element of two tachyons and two
massless NS states, the S-matrix element of four tachyons, and the S-matrix
element of two tachyons and two Ramon-Ramond vertex operators, in type 0
theory. We then find an expansion for theses amplitudes that their leading
order terms correspond to a covariant tachyon action. To the order considered,
there are no $T^4$, $T^2(\prt T)^2$, $T^2H^2$, nor $T^2R$ tachyon couplings,
whereas, the tachyon couplings $F\bF T$ and $T^2F^2$ are non-zero.
