In this paper, it has adopted the sol-gel method to prepare Ca_6Sr_4(Si_2O_7)_3Cl_2:Ce~(3+),Eu~(2+),Sm~(3+) White Fluorescent Powder for LED and discussed the influence of Ba~(2+) amd Mg~(2+) adding on its luminescence property. The result has shown that the Ba~(2+) and Mg~(2+) has increased the luminous intensity of high fluorescent powder to a large extent and the optimum dosage concentration is respectively 0.20 and 0.1, besides, along with the increase of added quantity, the sample luminous intensity ha...