In order to improve the sweep efficiency of water flooding in matured oilfield, soft moveable gels (SMG) are developed. The new types of SMG are made of novel, expandable particulate materials. The gels are preformed, stable, size controlled, non-toxic and can reduce water permeability without affecting oil permeability significantly. In this paper, some relevant laboratory methods are carried out for the determination of their main characteristics, including the displacement mechanism, the physio-chemical properties, moblility in porous media and the adjustment of permeability. Furthermore, the properties in bottles and behavior in porous media have also been investigated. The results shows that: 1)the swelling times of SMG are approximately 10, 2)SMG can remarkably improve the efficiency of water flooding, 3)remaining oil startup in low permeability formation, multistage fluid diverting and deep profile control are the main oil displacement mechanisms, 4）the new promising gel system of SMG have extensive application prospects in deep water shutoff and conformance control.