Parameters dominating swirl effects on turbulent transport in swirling flow are derived, focusing on the generation terms appearing in stress-scalar-Aux transport equations. <(vw)over bar> and partial derivative(rW)/partial derivative r are the factors which determine the characteristics of swirl effects on stress <(uv)over bar> and scalar flux <(vc)over bar>. In the case of partial derivative(rW)/partial derivative r less than or equal to 0 and <(vw)over bar> > 0. swirl has the effect of promoting turbulent transport, whereas in the case of partial derivative(rW)/partial derivative r > 0 and <(vw)over bar> less than or equal to 0, it has the effect of suppression. In the case of partial derivative(rW)/partial derivative r > 0 and <(vw)over bar> > 0, swirl can exert either of these effects.