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Supermassive black holes reside in the center of galaxies with mass equal or less than 106 M⊙ which is so-called low-mass black hole(LMBHs)are important for studies of BH formation and growth,galaxy formation and evolution,and active galactic nuclei AGNs.Futhermore the mass function of the present-day LMBHs and their host galaxy properties can be used to discriminate between different models for seed BHs and help shed light on the coevolution of BHs and galaxies.We are conducting a systematic search of LMBHs in active galactic nuclei with broad Hα emission lines,aiming at building a homogeneous sample which is more complete than previous ones for fainter and less massive sources.Hence we developed a set of automated selection procedures and applied them to the Tenth Data Release of the Sloan Digital Sky Survey.Currently we obtained a QSO catalogue from SDSS DR10 with accurate emission line measurements around Hα and Hβ regions.It is estimated that there would be a sample of low-mass black hole with~1000 candidates ultimately which is three times than previous version.