In four typical weather(sunny,partly cloudy,cloudy and rainy days) in Yiyang City, we tested the performance parameters of four kinds of solar cell including monocrystalline silicon cell, polysilicon cell, and amorphous silicon thin film cell. Compared the electric efficiency of the three kinds of solar cells,the results show that:In sunny or partly cloudy days,the electric efficiency of monocrystalline silicon solar cell was the largest,about 10.0%,the electric efficiency of polycrystalline silicon solar cell was larger, about 9.0%,and the electric efficiency of amorphous silicon cell was the...