1, location. Shenzhen is located in the southern coastal area of China, which is relatively humid, providing conditions for the growth of cockroaches. The number of cockroaches is very large, while Fuzhou is a typical estuary basin, and the growth conditions of cockroaches are insufficient.

2. Climate. Shenzhen is a humid climate with subtropical monsoon climate, with long summer and short winter, and cockroaches grow very big, while Fuzhou has a mild climate and cockroaches grow small.