Butterflies are known as "flying flowers" and are a very beautiful class of insects. Most butterflies are medium to large in size, with a wingspan of 15 to 260 mm and two pairs of membranous wings. The body is long cylindrical and divided into three parts: head, thorax and abdomen. The body and wing membrane are covered with scales and hairs, forming various colored markings.

Different species or groups of butterflies have different numbers of years. There are species with one generation per year, that is, Yihua, which is characterized in that the population is less affected by small changes in environmental climate, but the impact caused by large changes in environmental climate will be more significant; Usually, the number of generations increases with the increase of the average temperature, and the population dispersal ability is strong under the premise that the host is guaranteed, and the population number is greatly affected by changes in the environment and climate.