[1]Institute of Applied Physics and Computational Mathematics;
Beijing 100094;
China;
[2]LSEC;
Institute of Computational Mathematics;
Academy of Mathematics and System Sciences;
Chinese Academy of Sciences;
P.O.Box 2719;
Beijing 100190;
China;
[3]School of Mathematical Sciences;
Tongji University;
Shanghai 200092;
China;
High contrast.Mixed FEM; DD preconditioner; Spectral coarse space;