I suppose it is not possible to flip text, since it would compromise the readability of the text. Why would you want to do that?
You could create an image of the text and flip the image, although it does not make sense to me...
I want to flip the text according to stream direction, so how to create image?
Do you mean the feature labels?
To change the orientation of labels go right-click on your layer and select Properties then the Labels tab. There is a button Placement Properties:
The parallel or curved options should make the labels match the stream directions.
thank for your reply i will try.
Check out these results when flipping features and text:
As Xander says as soon as you flip text you end up with a mirror image that does not make much sense. The flip both example is the same as rotating text 180 degrees:
Generally, text that is upside-down (at any angle) becomes hard to read. Mirrored text is even harder to read.