Manash,
Unfortunately, that is a very vague description of the problem!
Do you have a system with one CCS and multiple ODS/CIC Servers, or just a single ODS?
What kind of Campaigns are you trying to run? (Predictive, Power, Preview or Agentless)
Is the Campaign not running, or not dialing, or not sending calls to the Agents? (These can appear similar, but are very different!)
What does Dialer Health View say (if anything)?
Are the Campaigns set to follow a Schedule, or are you starting / stopping manually?
Does IA / ICBM show the campaign as running?
If you do a "Run Test", do you see callable rescords?
Are you using Timne Zone Blocking?
Skills?
We'll do our best, but need more to go on ;-)