The foundamental theory of a rotatory optic fiber is briefly described

the numericanalysis and calculation for the rotatory optic fiber have been done and the parameters（v.βi.ui.wiand Ki） of a single mode rotatory optic fiber

as an example

are calculated in this paper. In general

it may make some troubles for calculating the fiber when the tensor dielectric coefficients ε1 .ε2can not be known previously for the rotatory optic fiber. We conclude a handy numeric way for calculating the rotatory optic fiber as ε1 and ε2 not known yet.