Cockroaches are found all over the country except in a few areas. Because the suitable temperature for cockroaches to live is between 10-50℃, they start to hibernate below 10℃, start to crawl crazily above 50℃, and die at 60℃ or below 0℃ for a long time, so you can judge whether there are cockroaches according to the temperature. It is worth noting that the temperature I mentioned earlier refers to the temperature of human living space. For example, in winter in northern China, the outdoor temperature is below 0℃, but due to indoor heating, the temperature is generally higher than 10℃. It is still common that cockroaches belong to the north in winter. The few areas mentioned above include Qinghai, Tibet and other areas that are cold all the year round. However, with the improvement of people's living standards, many people in these areas began to heat in winter, so cockroaches began to appear.

The common cockroaches in China are Blattella germanica, Periplaneta americana and periplaneta fuliginosa, among which Blattella germanica is the most common cockroach and can be seen all over the country. Strong adaptability, super fertility and easy to produce drug resistance, it is difficult to kill and eradicate. Periplaneta used to be very common, but now it is only distributed in southern China, such as Guangdong and Fujian.