In real hot galvanizing production, it is frequent that a part of workpiece surface is not galvanized and even the precision dimension of the part is required on the basis of customer demand or the particularity to be galvanized. In this case, it gives many difficulties to hot galvanizing factories. In the past, paintapplying, packing and sealing methods do not solve these problems radically. In order to satisfy the requirements of vast galvanizing factories, Xinyue company has developed “ZD-Ⅰ” and “ZD-Ⅱ”type galvanizing inhi- bitors. The various experiments data and industrial scale production indicate that the inhibitors have sim- ple operation, easy elimination and low cost, and so are well received by vast hot galvanizing factories.