This paper studied estimation of the phase parameter of a two-state system in a squeezed bath,investigated the effects of the parameter N and the squeezing phase  of the squeezed bath on quantum Fisher information,and focused on the enhancement of the estimation precision.The results showed that,the quantum Fisher information decays with time and changes periodically with the squeezing phase .When the value of the squeezing parameter N is larger,the quantum Fisher information decays more slowly and the estimation precision can be enhanced.