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In this paper,robust stability of nonlinear plants represented by non-symmetric Prandtl-Ishliuskii(PI)hysteresis model is studied.In general,PI hysteresis model is the weighted superposition of play or stop hysteresis operators,and the slopes of the operators are considered to be the same.In order to make a hysteresis model,a modified form of non-symmetric play hysteresis operator with unknown slopes is given.The hysteresis model is described by a generalized Lipschitz operator term and a bounded parasitic term.Since the generalized Lipschitz operator is unknown,a new condition using robust right coprime factorization is proposed to guarantee robust stability of the controlled plant with the hysteresis nonlinearity.As a result,based on the proposed robust condition,a stabilized plant is obtained.A numerical example is presented to validate the effectiveness of the proposed method.