Aim To adapt the need of high-quality Al-alloy casting and to enhance the competitive ability of its products in the international market. The advanced molten devices which fit into national conditions of China is exploited. Methods The advanced DC electromagnetic pump is used. Results The first native low-pressure casting system with DC electromagnetic pump for molten Al-alloy is developed. Conclusion The principal indices of the system can meet the main requirement for the medium-sized and small-sized part casting.