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We investigate the discrepancy between the two-dimensional projected lensingmass and the dynam- ical mass for an ensemble of 97 strong gravitationallensing systems discovered by the Sloan Lens ACS (SLACS) Survey, the BOSSEmission-Line Lens Survey (BELLS), and the BELLS for GALaxy-Ly{\alpha} EmitteRsYs- tems (BELLS GALLERY) Survey. We fit the lensing data to obtain theEinstein mass, and use the velocity dispersion of the lensing galaxies providedby the Sloan Digital Sky Survey (SDSS) to get the projected dynamical masswithin the Einstein radius by assuming the power-law mass approximation. Thediscrepancy is found to be obvious and quantified by Bayesian analysis. For thesingular isothermal sphere (SIS) mass model, we obtain that the Einstein massis 20.7% more than the dynamical mass, and the discrepancy increases with theredshift of the lensing galaxies. For more general power-law mass model, thediscrepancy still exists within 1{\sigma} credible region. The main reason ofthe the discrepancy could be mass contamination, including all invisible massesalong the line of sight. In addition, the measurement errors and theapproximation of the mass models could lead to part of the discrepancy.

The discrepancy between Einstein mass and dynamical mass for SIS and power-law mass models