  We obtain the closed form of the correlation function of one current and four
spin operators (with different chiralities ) in type IIA superstring theory.
The complete form of the S-matrix of one gauge , two fermions (with different
chiralities) and one closed string Ramond-Ramond for all order $\alpha'$ type
IIA has been explored. Moreover, we make use of a different gauge fixing to be
able to find out all the closed forms of $<V_{C} V_{A}V_{\bar\psi}V_{\psi} >$
correlators. An infinite number of $t,s-$channel fermion poles of this S-matrix
in the field theory of IIA is generated. Unlike the the closed form of the
correlators of the same amplitude of IIB, for various $p,n$ cases in type IIA
we do have different double poles in $t,(t+s+u)$ and in $s,(t+s+u)$ channels
and we produced them. We also find new Wess-Zumino couplings of IIA with their
third order $\alpha' $ corrections as well as a new form of higher derivative
corrections (with different coefficient from its IIB one ) to SYM couplings at
third order of $\alpha' $. Using them, we are able to produce a $(t+s+u)$
channel scalar pole of the $<V_{C} V_{A}V_{\bar\psi}V_{\psi} >$ amplitude for
$p+2=n$ case. Finally we make some comments on $\alpha'$ corrections to IIA
Superstring theory.
