Abstract: The current status and progress of porous hydrogels are summarized. The introduction of porous structure greatly enhance the swelling rate and equilibrium absorbency of hydrogels，which can be applied to the preparation of hydrogels with environmental sensitivity. The preparation methods for porous hydrogels are presented and their advantages and shortcomings are discussed，such as the foaming technique，the porogenic technique，the phase separation technique and the frontal polymerization method etc.