Indoor location based servicedemandsprecisevertical height information and its degree of distinguishing in the vertical position should be decimeter,so that we can precisely recognize the building floor where the users are,then realize three-dimensional holographic positioning for indoor location based service.Differential barometric altimetry can realize sub-meter positioning accuracy for vertical positioning in indoor and outdoor universal environment.But due to the limitation of principle of differential barometric altimetry,this altimetry cant realize sub-meter vertical positioning accuracy in local abnormal temperature region.This paper proposes a enhancement correction model for correction to the error of differential barometric altimetry in local abnormal temperature region.The simulation and experiment are also set up to verify the performance of this model.The verification results show thatthe model realizes the correction for error of the altimetry and keep it having sub-meter positioning accuracy in local abnormal temperature region.This model enhances the robustness of differential barometric altimetry.