B, the existing trademark is poor (losing credibility among consumers) and re-entering the market with a new look;

C, enterprise reorganization, the reorganized enterprise loses its original trademark.

D. The trademark expired and was registered by others after forgetting to renew it, so we had to replace it with a new one.

E, although the trademark has been used, but did not apply for registration, others (peers) to apply for registration first, in order to avoid risks, can only change the trademark.

F, in order to meet the needs of market development, enterprises must constantly develop new products, and the quality of new products is uncertain. In order not to affect the old trademark, it is wise to change a new trademark.

G. Other information (I didn't expect it for the time being, and other packages are welcome to supplement it)