I don't understand what you want exactly, but there is ExportAllStories in script panel that's export text to RTF.
Actually I want to export RTF format file with its paragraph style names must be appeared in the side as like below:
H1 => Intruction
TX => Unknown dialysability. Dose as in normal renal function ....
Please help me
ID has no built-in way to export a story as RTF with style labeling in a column next to the text, similar to what you would see in Story Editor view, but there is a remote possibility that this could be scripted (ask in InDesign Scripting) or perhaps you can make InDesign Tagged Text work for you. Try exporting a few paragraphs to tagged text and see if it would be useful.