A catalog of the stellar atmosphere parameters of cool dwarfs in Gaia DR3, which is based on multi-band photometry from optical to infrared. The two files of .csv and .mrt contain the same contents. The information of csv file is as following: row number: 1,806,921. columns number: 24. columns names: column 1. 'Gaia DR3 SourceID': (sourceID in Gaia DR3) . columns 2-3. 'ra', 'dec': (right ascension and declination of object). columns 4-11. rmag', 'imag', 'zmag', 'Jmag', 'Hmag', 'Kmag', 'W1mag', 'W2mag': (absolute magnitude in multi bands). columns 12-17. 'TEFF_RF', 'TEFF_RF_ERR', '[M/H]_RF', '[M/H]_RF_ERR', 'LOGG_RF', 'LOGG_RF_ERR': (parameters and errors by RF). columns18-23. 'TEFF_LGB', 'TEFF_LGB_ERR', '[M/H]_LGB', '[M/H]_LGB_ERR', 'LOGG_LGB', 'LOGG_LGB_ERR': (parameters and errors by LightGBM). column 24. 'flag': (the boundary of BP - RP = 2.9 mag, flag = 1 while BP - RP > 2.9, otherwise flag = 0).