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Super-Eddington accretion onto black holes remains mysterious.We have completed 3 years of campaign of monitoring about 30 candidates of super-Eddington accreting active galactic nuclei through the Chinese Lijiang 2.4m telescope.Four fundamental things are found from this campaign:1) super-Eddington accreting AGNs indeed exist in the Universe,some of which accretion rates can reach up to 2000 L_Edd/c^2;2)Hbeta lags are shortened with increases of accretion rates by huge factors up to 10;3)saturated luminosity of super-Eddington accretion onto black holes;4) SEAMBHs are radio-quiet.These properties have important implications to accretion physics,cosmic growth of black holes in galaxies and potential application for cosmology.