Father passed away before putting land in my name.Have several witnesses (uncles,aunts,father's close friends) all heard him say it mine.what can I do

Your father's saying that the land is yours does not make it so from a legal point of view.  You don't say whether your father left a Will, whether he owned the land with anyone else, or who has the legal right to inherit this land.  You do not have a legal claim against that person or persons, but you could seek their cooperation if your father's wishes were known to all.  In that case, you either can enter into a written agreement that the land will be transferred to you, or they can transfer their interest(s) in the land to you by signing a deed.