The standing position and ship arrangement of a TSHD are restricted by rainbowing distance.By analyzing rainbowing distance parameters,this paper deduces not only the ideal model of calculating rainbowing distance but also another model which involves the air resistance.By TSHD experimental verification,the accuracy of the model involving the air resistance is much better than the ideal model.On the basis of rainbowing distance calculating model,the mixture moving trail affected by the parameters is analyzed,which is helpful for a TSHD to have an optimum standing point and control points in the rainbowing construction.