Abstract: The size and number of residue droplets are affected by the soap bubble bursting process. A study is performed to understand how the size and height of soap bubble influence the residue droplets and their distributions after the soap bubble bursting. It is seen in the experiment that the distributions of the residue droplets have a phenomenon of radioactive linear distribution when the bursting height is low. But the radioactive linear distribution will disappear with the increasing height. With the change of soap bubble volume，the rules of both droplets numbers and soap film thickness are analyzed. A power function dependence of the soap bubble volume on the droplets numbers is found. In the ideal condition，a power function dependence of the thickness of the soap film on the number of fragments is found. The results show that the residue droplets can be roughly divided into three types，i.e.，the small fragments，medium fragments and large fragments，according to the fitting result，which can be explained according to the three different stages of the soap bubble bursting process.

Key words: soap bubble bursting, radioactive linear distribution, soap film, fragment