Transgenic phytase gene corn is mainly used for feed processing. The contained phytase can decompose phytate phosphorus in feed and release inorganic phosphorus that can be used by animals. At the same time, it can reduce the content of phosphorus in animal manure and reduce Environmental pollution; it can also reduce the investment in plant, equipment and energy when producing phytase by industrial fermentation. Therefore, the phytase produced with corn as a carrier is directly used for feed processing, which realizes environmentally-friendly and energy-saving agriculture The dream of producing "green" phosphorus by production methods has huge industrial advantages and application prospects. The correct understanding of this text is:. ['Maize feed processing technology with phytase gene is quite mature.', 'Using phytase gene corn processing feed is in line with the environmental protection concept of modern green agriculture.', 'Planting phytase gene corn has less investment and great returns.', 'Corn-based phytase production will replace modern industrial fermentation methods.']