maya ik in unity

how can i have controule on maya ik handle in unity.i meant i want to animate ik inside unity

You can't export IK setup itself.

If you want to export IK animation from Maya, then you need to bake your animation during export.

If you want to have IK in Unity, then you need to do some scripting. IKSolver in LocomotionSystem would be a good start.