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Cu2ZnSn (SSe), (CZTSSe) thin films were synthesized by different liquid phase precursors. The re-sults showed that the activity of Zn source in the precursors directly affects the properties of CZTSSe crystal materials. It was found by X-ray diffraction and scanning electron microscope that the zinc source provided by hydrazine, S powder and zinc powder was not easy to form nuclei, and the reaction temperature was higher, but it was easy to form large crystals. The energy conversion rate of CZTSSe crystal was 6.21 %. The zinc source provided by dry ice, N2H4 and zinc powder was easy to form nuclei, but the subsequent reaction of crystal growth was difficult and not easy. The energy conversion of CZTSSe crystal was only 5.50%. The effects of different Zn precursors on the structure, crystal size and conversion of CZTSSe thin films were revealed, and the mechanism was preliminarily discussed. [ABSTRACT FROM AUTHOR]