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This article proposed a new alumina concentration analysis technology"quickly analysis alumina contents by using X ray diffraction".It can complete the measurement of the molecular ratio, calcium fluoride and produces the alumina density within 2 minute.It makes the alumina monitoring possible.This technology is home and international origination.Its application provid ed effective technical support for "developing the 300KA integrated control technology" for the second aluminum factory at Yi Chuan.The second aluminum factory at Yi Chuan control alumina concentration between 1.5 ~ 2.5 %, which causes a 200,000 tonsseries 258 300KA electric tanks actual average effect coefficient below 0.08/date, the effect controlling rate was achieved above 90 %, truly realizes the low density fine control of the alumina.The current efficiency is re markably enhanced to 94 % and above, the direct current consumption is below 13000kwh/t-Al.Both have achieved the international advanced level.This technology effectively reduced noxious gas discharging, remarkably enhanced environmental protection.