New analytical equipments and their work condition at Sakai iron plant which produces steel ingots of 4, 500, 000t/ year are described. Main equipments, which analyse rapidly (about two minutes for one steel) and automatically iron, steel, slags and sinter, consist of an analytical computer (Quantac 502) belong to two photoelectric vacuum spectroscopic analysis apparatus (Quantvac) and a fluorescent X-ray analysis apparatus (VXQ). The analytical center is arranged in the office for converter plant. At the 1 st floor, an instrumental analysis room, a sample prepared room and a water analysis room is arranged. At the 2nd floor, two wet chemical analysis room, a fuel analysis room and a gas (in steel) analysis room is arranged. Also, the analytical center is connected to the converter plant, the blast furnace plant and the raw material testing center by the air shooter. The molten steel sample at the converter plant is shooted by the air shooter and is prepared automatically by the automatic sample preparater. Analytical results from Quantvac and VXQ is reported automatically by Quantac 502 as input of the process computer at the converter plant. Then, a, new type fluorescent X-ray analysis apparatus is made by Shimadzu Co., Ltd., is named VXQ-P, is attached the three program scanner and the two pulse height analyser, and is used analysis of iron ores.