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32nd European Photovoltaic Solar Energy Conference and Exhibition; 1226-1228, The effect of Ag incorporation into CZTSSe kesterite solar cell by a non-vacuum environmentalfriendly process has been studied. We first demonstrated the fabrication of (Ag, Cu)2ZnSn(S,Se)4 kesterite solar cells using chemical spray pyrolysis. Ag content in the ACZTSSe thin film can be controlled by precursor solution concentration. For kesterite with high Ag content, aggregation of grain and formation of second phases occurred at elevated temperature, but can be solved when being annealed at relatively low temperature. Enhancement of grain size at lower process temperature is fulfilled by Ag incorporation. With 20% Ag addition, efficiency of the kesterite increased from 5.3% to 6.8% with the improvement of VOC from 388 mV to 444 mV. Bandgap of ACZTSSe can be controlled from 1.06 to 1.2 eV with Ag content varied from 0~50% and the tailing energy was reduced by Ag.