Abstract: More and more research results indicate that secondary pores of sandstone devclope during dissolution of silicate, especially aluminosilicate minerals, instead of carbonate cements. Decay boxylation of organic matter in the process of maturation increases the anion density of organic acid in pore water solution,and promotes the dissolution of aluminosilicate minerals. The essence of dissolution is mobility of aluminium. Based on experiments,this paper studied the organic-inorganic interaction, solubility of different minerals under the effect of organic acid,and pointed out the dynamics factor which influence the mobility of aluminium. The authors disscused the forming mechanism of secondary pores as well.