Abstract: The phenomenon that water content redistribution occurs in a saturated sand due to the application of shear in naturally drained conditions is referred to as “water absorption in shear”. A new test method was developed to reproduce the water absorption in shear for post liquefaction sands over a wide range from looser to dense density. The test results showed strong dependency of the post liquefaction stress strain response on rates of the water absorption in shear, and the others gave out the conditions for judging whether large post liquefaction deformation occurs.