Using the method of figureanalysis, we investigated the interaction between rotating solitary waves for (2+1)dimensional dispersive longwave equations, and found some new nonlinear phenomena of rotating solitary wave interactions. These phenomena are: (1) the interaction between rotating solitary waves is completely nonelastic, (2) two rotating solitary waves may merge into one rotating solitary wave or one nonrotating solitary wave through the collision, and at the same time waveform conversion or property change of solitary wave may happen.