Record and analysis of physical quantities in the friction stir welding process could provide significant data support for understanding joint formation process and factors which effect weld quality. In this paper,0.8 mm thick 1060-H24 ultra-thin aluminum plates were welded by micro friction stir welding,with the aim to study the changes of welding force and temperature in the welding process. A self-made monitoring system was used to measure the welding force and temperature under different tool rotation speeds in real time.The result of this study shows that the weld temperature reaches highest,that is about 350 ℃,when the stirring speed is 11 000 r/min. At that temperature,the base metal reached the plasticized state and weld metal has good fluidity. Therefore,the joint with high performance and a surface free from defect could be easily formed. After the stir tool is pressed into the base metal,in the initial stage of welding,the axial force is maintained at about 50 N. After 2 s,it rapidly drops to about 30 N and remains until the stir tool reaching the end of base metal. And in this process,the transverse force remains stable which is about 20～40 N with small positive fluctuations.