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if a actor's key down(up) is set to y = y -9; it should fly when we press the given button.how to disable the key
when it collides with another character ,and the character should have gravity so that it will fall to the ground.any idea! please?

To do that you need a variable. I'd suggest you create a variable that holds the state of the actor (state).
actor -> KeyDown (up, Repeat) -> Script Editor

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if(state==0)
{
    y=y-9;
}

The above says only when state is zero do you have the actor fly. So, if you want to disable the flying ability, set it to 1.
actor -> Collision (otherActor) -> Script Editor

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state=1;

Now flying will be disabled. I assume you want to enable it as soon as you touch back on ground, so in your collision with top side of the ground actor, add this.

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state=0;

This type of variable control will help a lot, when making a game. The idea is pretty simple and very powerful. If you understand this, then you can have many different values for the state variable, and control the actor very precisely.

Thanks SKI it worked.