Abstract: Bubble happened and migration device has been applied to carry out the research on the bubbling ability, stability, size distribution, sealing characteristics and regeneration capacity. The results indicate under the same conditions, the bubble size is relatively larger with larger distribution. When the main bubble size is dispersing, the apparent viscosity is bigger and the bigger the sealing differential pressure, the better the sealing property. The foaming agent AES has a strong bubbling ability, good stability and good regeneration capacity. The bubbling ability is less affected by concentration. When the concentration is low, the sealing property is better and the ability to resist the dilution of formation water is strong. The foaming agent AES was applied in foam flooding of Chendong oilfield in 2005, and the well head pressure of injection well increased by 5.2 MPa and the Hall resistance coefficient increased to 4.86. Both the pressure and the coefficient much bigger than that of in polymer flooding, indicating AES foaming agent has a better bubbling ability and sealing property.