Now i have new id and make new id and replace new id with. How to remove old id from ipad ? And purchase with new id .now i cant purchased with new id please help me
You don't actually remove the old ID - you sign out of that ID and sign into the new one.
Go to Settings>Store>Apple ID. Tap on the ID (assuming that the current one showing is the old ID) and then tap sign out. Then sign into the new ID.
Any purchases that you made with your old ID are always tied to that ID and must be updated by using the old ID.