On the basis of rock mechanics and groundwater dynamics，we have previously reported a “permeability method”to measure relative changes of the aquifer crustal stress． Herein，we report the new development of the permeability method for continuously monitoring the absolute crustal stress． We provide a new approach to calibrate the experimental system so that the previously measured stress change can be converted to absolute values of the crustal stress． It is physically evident that the new method allows continuously monitoring absolute values of crustal stress． It is also highly sensitive and can be easily constructed．