Based on the stress-strain relation energy relation and wave equation in Biot theory on acoustic propagation in a fluid-saturated porous medium,an equation of acoustic intensity is derived with the similar way used in an isotropic solid.

• 根据Biot多孔介质声学理论中的应力-应变关系、能量关系、声波方程,采用与在均匀固体介质中平行的方法,推导了流体饱和多孔介质中的声强表达式,进一步完善了多孔介质声学理论。