The Luobei Sag in the northeast of Lop Nur bears abundant confined potassium- rich brine that is one of the most important reserve resources of potash. In this study, an improved mining technology for confined brine from areas of weak water abundance in the brine well 3~11 was conducted using method of atmospheric connection and water injection in the auxiliary well. The obtained data from five group and long- term pumping tests shows that the application of these methods can increase the reservoir space and enhance hydraulic connection of confined aquifers, and thus increase specific capacity by up to 22.7%. It further confirms the validity of using method of atmospheric connection and water injection in improving mining production for confined brine in the Luobei sag. The mining rates are associated with the distance between auxiliary well and mining well and the injected volume of water into the auxiliary well. Our result can provide a reference for the next large- scale mining of confined brine in the Luobei sag.