BSCCO thin films are fabricated via a co-deposition process by an ion beam sputtering with an ultra-low growth rate, and sticking coefficients of the respective elements are evaluated. The sticking coeffi-cient of Bi element exhibits a characteristic temperature dependence : almost a constant value of 0.49 below 73$0^{circ}C$ and decreases linearly with temperature over 73$0^{circ}C$. This temperature dependence can be elucidated from the evaporation and sublimation rates of bismuth oxide, BiulcornerOulcorner, from the film surface. It is considered that the liquid phase of the bismuth oxide plays an important role in the Bi(2212) phase formation in the co-deposition process.