A new maize variety called Jiangdan No.4 was created by crossing two specific inbred lines. This hybrid maize has high yield, stable production, disease resistance, and can grow well in various conditions. The yield of Jiangdan No.4 ranged from 10,267.1 to 10,625.3 kg per hectare. It is suitable for planting in a specific temperature zone in Heilongjiang Province.