  We give the geralized expression of spin precession of extended bunch
particles having both anomalous magnetic and electric dipole moments in storage
ring. The transversal betatron oscillation formula of the bunch is also given.
The latter is the generalization of the Farley's pitch correction
\cite{Farley}, including radial oscillation as well as vertical one. Some
useful formulae for muon storage ring are discussed in appendix.
