Xing Wei is professor at BNU. He studied BS at Tsinghua and PhD at Cambridge then worked at ETH, Gottingen, Princeton and SJTU before joining BNUI will report on my recent projects about tide and magnetic field of celestial bodies such as star, exoplanet and exomoon. The projects are as follows (1) stellar magnetic dynamo (2) stellar oblique rotator (3) stellar wave transmission (4) magnetic tide (5) tidal resonance (6) exoplanet's inflation (7) exomoon's retention.