Abstract: The secondary pores of the Mesozoic sandstones in the Turpan-Hami basin weremainly formed by the dissolution of unstable components of sandstones. The secondarypores were distinguished to be of eleven types in three developmental zones The formationand preservation of the effective sandstone bodies. the diagenetic evolution of organic material and clay minerals in mudstones, and dissolution of unstable components in sandstones are the main cause for the formation of the solution pores.