Under the concrete guidance of the specialists in many disciplines and fields and on the basis of the hot gal- vanizing experience of several ten years and the advanced foreign alloy formula, the company has developed Xin yue Brand special alloy for hot galvanizing successfully,and thus solved the difficult problem in the hot galvanizing production and increased economic benefit. At present, some alloys sold in the domestic markets are not clear in the function and quality and the compositions of the greater part of them are kept secret. The main problems in the special alloys production are as follows: the technology process does not conform to scientific demand, or the proportion of alloy content is too low,oritsformula is not right, or the alloy is made using waste and mixed mate- rials and so some harmful elements aretransferred in zinc pot. Because oft he above mentioned causes and use of some off-grade “multi componentalloy ”, zinc ash and cadmia is increased, coating surface quality is affectedthe using life of zinc pot is reduced, and even liquid zinc quality is damaged and normal production can’t be carried out. The customers are difficult to select proper special alloy due to various alloys in market. The corrosion-resistant method of iron and steel parts through hot galvanizing process was adopted over a long period of time. In 1742 French scientist found that zinc can protect iron and steel against corrosion effectively to extend their using life. In 1837 hot galvanizing method is patented in France and up to now it has a history of more than 100 years. With the rapid development of industry and agriculture andespecially that of power supply and communication trade, the higher demands for the corrosion-resistant ability and use life of the steel structural parts have been putforward. How to satisfy the abovementioned demands? For this reason, the improvement of the modern hot dip galvanizing technology and process is necessary. The main problems in the hot dip galvaniz- ing technology are as follows: rough surface, salamander, flow mark, black spot and dot, plating-missing,spall of coating layer and white rust. There are many causes, which induce the abovementioned defects, such as pretrea- tment, composition of molten zinc, steel material quality, etc. In the present years, with the popularization of continuous casting technology in the iron and steel enterprises, the proportion of the silicon-killed steel to total steel products is growing. Because the silicon element in steel product can speed up the reaction between zinc and iron, as a result coating color is changed and color difference is serious. The difficult problem in the technology is a real headache forquite a few hot galvanizing plant and is also an important and key research project. For this reason, Ourcompany has developed Xinyue Brand special multi-component zinc-based alloy for hot galvanizing. It has successfully solved this technical difficult problem and decreased production cost considerably. Through summing up experience of many years and constant improving, the zinc-based alloy has been used in many hot galvanizing plants at home and abroad and played an important role.