Impact organizational culture on HRM and employee's performance, is a piece born out of research to redefine the silence role organizational culture plays in driving organizational success. most of the failure recorded in today's business is as a result the neglects of cultures of the immediate environment(internal and external). Business must identify all culture that has found it way into the business either consciously or unconsciously. sometime we seem to kept in holistic the founders philosophy even when is not achieving positive result. this work highlighted those cultures that need to be eliminated that are no longer accepted by the business stakeholders and promotes those new cultures that are desirable and its reflect on the HRM practice. All employees should be inform of the cultural adjustment in order to give them an opportunity to perform in the new order. Schein (1984) defines cultures as the way we do things around here. things must done on the basis of the presentnot what is no longer acceptable.