Abstract: The soap bubble often appears in daily life and physics. Particularly，it is mentioned when to introduce thin film interference as an example. Peoplewonderwhatisthickness of various soap bubbles. Inthispaper， theinterferencepatternsonthesurfaceof soap bubblesareobserved and photographed. With simulation of the light spectrums of LED's ray and the spectral sensitivity functions of the camera，the thickness of soap bubble is measured with color-matching. Finally，it is pointed that monochromatic light for this experiment is more advantage to white light.

Key words: soap bubble, thin film interference, color simulation, color-matching, white LED