Studies were made on the influnce of alloying content, alloying elements and deformation conditions on the internal friction behavior during strain ageing of aluminium alloys. Therefrom, a description was made on the distribution of point defects and dislocation configuration. It was pointed out that the factors controlling the recovery process of strain ageing are the mobility of solute atoms and interaction energy littween dislocations and solute atoms. A complex model including unpinning of dislocation string and dislocation-atmosphere dragging was proposed. which can describe the interaction between dislocation and point defects in the, process of strain ageing. A corresponding theoretical treatment was made to explain the exper-imental phenomena reasonably.