Bacteria reproduce asexually generally by simple diploid division, with some differences between the specific processes of gram-positive and gram-negative bacteria. 1. Gram-positive bacteria: the intermediary body is connected to the chromosome. Bacterial division of the bacterial cell volume increases, chromosome replication, the intermediary body into two, the chromosome is pulled to the two sub-cells, followed by the cell membrane invagination to form a partition, and finally the cell wall invagination, splitting the two bacterial cells, that is, the completion of a division. 2. Gram-negative bacteria: no intermediary body, the chromosomes are directly connected to the cell membrane, when the new cell membrane formation, the chromosomes are separated in the two bacterial cells, and finally the cell wall invagination will be the whole cell division into two daughter cells. Bacterial growth and reproduction is manifested as an increase in the components and number of bacteria, generally asexual reproduction by dichotomous division, when the conditions are suitable, most of the bacteria multiply very quickly.