  The relation between shapes of cosmic string and baryon number violation is
investigated. If there exist fermionic zero modes on the string, using
bosonization technique, it is possible to obtain the effective action which
describes the fermion coupled to the arbitrarily shaped cosmic string. The
relation between baryon number and the sum of the writhing number and linking
number of the cosmic strings is rederived. Baryons are created on the strings
as the shapes of the cosmic strings change. Furthermore we discuss implications
of this baryon number violating process to baryogenesis.
