Active galactic nuclei are characterized by the prominent broad emission lines from optical to ultraviolet bands, however, their origins remain open as long-term outstanding issues. I will extensively review this well-known problem. NIR and Hbeta reverberation mapping campaigns provide strong constraints on physical conditions of ionised gas as well as black hole spins in the central regions. The growing evidence suggest a new global scenario from dusty torus, BLR to accretion disks.

BIO：
Jian-Min Wang was graduated from Department of Applied Physics, National University of Defence Technology in 1987 and got PhD from University of Science and Technology of China in 1995. He worked in Tuebingen University under the support of A. v. Humboldt Foundation and in Kyoto University as a COE fellow. He was enlisted as Hundred Talent program and Distinguished Young Scholars of NSFC. He is working on measurements of black hole mass through a large campaign of reverberation mapping of various kinds of active galactic nuclei. The scientific goals of the project aim at the application of super-Eddington accreting massive black holes to measurements of history of Universe expansion and discovery of close binaries of supermassive black holes for low frequency gravitational waves.