Polarization spectroscopy is of high sensitivity and resolution. A method based on the adjustable balance probe polarization spectroscopy is proposed, the change of the spectroscopy shapes in different polarization planes is investigated, and the retroflexion of the lineshapes with the rotation of the polarization plate is observed. The retroflexion of the lineshapes is illustrated by combining the polarization theory and the balance probe theory, which is in good accordance with the experiment. The relationship between the peak-to-peak value of the dispersion-like spectroscopy and the power of pump beam is also demonstrated, and it is found that the saturation of spectroscopy amplitude appears when the power ratio of pump beam to probe beam is about 100, which provides a theoretical reference on choosing parameters in the laser frequency stabilization by using polarization spectroscopy.