LDPE light conversion film of 0. 2% , 0. 5% , 1. 3% and 2% ( mass fraction) rare earth europium light conversion agent were prepared. The transmission spectrum was measured in the range of 200 ~ 800 nm. The LDPE light conversion films were used for packaging orange flavor solid beverage whose color change was observed when under UV light. With absorbance of orange flavor solid beverage as color index, the relationship between absorbance and UV light exposure time were obtained. The result showed that the transparent LDPE light conversion film containing 1. 3% rare earth europium light conversion agent can be used as the packaging material of the product, which will make its color keep the longest time.