  We present results of time series photometry to search for variable stars in
the field of metal-poor globular cluster NGC 4590 (M68). Periods have been
revised for 40 known variables and no significant changes were found. A
considerable change in Blazhko effect for V25 has been detected. Among nine
newly discovered variable candidates, 5 stars are of RRc Bailey type variables
while 4 stars are unclassified. The variable stars V10, V21, V50 and V51 are
found to be cluster members based on the radial velocity data taken from
literature.
