  We present a detailed study of the pulsating string solutions in AdS3 x S3
supported by both RR and NS-NS fluxes. This background has recently been proved
to be integrable. We find the dispersion relation between the energy,
oscillation number and other conserved charges when the NS-NS flux turned on is
small. We further discuss the fate of the string solutions in pure RR and NS-NS
cases.
