Plant transgene refers to plants with foreign genes in their genomes. It can be obtained by protoplast fusion, cell recombination, genetic material transfer and chromosome engineering technology, which may change some genetic characteristics of plants and cultivate new crop varieties with high yield, high quality, virus resistance, insect resistance, cold resistance, drought resistance, waterlogging resistance, salt tolerance and herbicide resistance, such as corn and rice, transgenic triploid Populus tomentosa and so on. In addition, transgenic plants or cells cultured in vitro can be used to produce expression products of foreign genes, such as human growth hormone, insulin, interferon, interleukin -2, epidermal growth factor, hepatitis B vaccine and other genes have been expressed in transgenic plants.