According to public information, there are more cockroaches in Hangzhou and Shanghai than in Shanghai. Cockroaches like to live in warm, humid, food-rich and crevice places. Compared with Shanghai, the environment in Hangzhou and Shanghai meets the living conditions of cockroaches.

Cockroaches generally refer to insects belonging to Cockroaches (scientific names), belonging to Arthropoda, Insecta and Cockroaches, commonly known as cockroaches, and are common medical insects.