how to manage a child which having a tantrums always?

Well 3 is a very good age for tantrums, so she isn't really acting out of the norm. IMO you have to feel your way to a solution. My oldest would respond to me throwing a tantrum just like hers, as in mocking her. She would get so mad she would stop for spite, LOL or it may have been I was showing her how she looked. My youngest was only encouraged by me mocking her, so I had to start acting like it made me cry when she did it. THAT worked for her, no matter how mad she is at her mommy, she doesn't want me to cry. I say be creative, try diffrent approaches and see what has the best result. At 3, spanking or time outs for letting out emotions, isn't good IMO so you really should try to find a positive approach. Hope this helps, Good luck.

Whenever our daughter throws a tantrum we found it's best to just ignore her. Or, I end up laughing at her. Some people say that's a good way to destroy her confidence. I say it's a good way to teach her that she's not always going to get what she wants.