An automatic address dispatch method for control of a plurality of light emitting units includes the following steps, Step 1: installing a server having a network float address protocol; Step 2: providing a light emitting device with the same network float address protocol as that of the server; Step 3: the server being connected to one or a plurality of the light emitting device via a network; Step 4: the server automatically dispatching a unique address to each light emitting device on the network according to the network float address protocol; Step 5: the server relatively controlling the response of each light emitting device on network by the unique address.