The correlation theory of characteristics of solar battery is represented，the relationships between open-circuit voltage，short -circuit current，optimum output power，optimum load resistance，packing factor of solar battery and light strength are studied by the experimental method. The results show that the open-circuit voltage， short-circuit current and maximum output power increase with the increase of light intensity，and optimum load resistance，packing factor decrease with increasing light intensity. It is shown that with weakening the light strength and increasing the optimum load resistance，which did not report for relevant theoretical analysis or simulation results. The other results are consistent with the correlation theory of characteristics of solar battery.