Abstract: This paper investigated the pore structure and pore size distributions of some porous clay composites by using N₂ adsorption at low temperature(77K) and discussed the influences of different crosslinking agents on its pore structure and pore size distribution. The results show that the synthesis conditions of porous clays, especially, the hydrolysed process of crosslinking agents, play a very important role in the influences in pore structure and pore size distributions of porous clays.