In order to explore the polarized-sensitivity bistable evolution of v ertical cavity surface emitting lasers (VCSELs) and further expand their applications in the field of optical informati on processing,the characteristics of frequency-induced polarization bistability of 1550nm-VCSEL subject to variable polarization optical injection are investigated by adopting the spin-flip model.The results show that through co ntinuously scanning the frequency detuning along different routes,two orthogonal polarization components of the VC SEL under variable polarized optical injection can achieve frequency-induced polarization bistability in the negative and the positive detuning regions,respectively.For the certain inject ion intensity,the increase of polarization angle of injection light can cause the gradual expansion of polariz ation bistable width in the negative detuning region,while the corresponding bistable width in the positive detuning region has no obvious change. When an appropriate injection angle is chosen,the larger injection intensity is more preferred to enlarge the width of frequency-induced polarization bistability in the negative detuning region. In addition,for the given polarization angle of optical injection,the frequency-induced bistable widths of polarizati on components in the VCSEL demonstrate different features when the bias current varies.The frequency-indu ced polarization bistability in the VCSEL subject to variable polarization optical injection can be controlled flexi bly by reasonably adjusting the polarization angle of optical injection and bias current.