一、关税保护水平确定的理论依据 从理论上说,衡量关税对一国经济的保护程度主要有两个指标:名义关税率和有效关税率。名义关税率是海关对具体进口的某一种产品征收的税率,显然,这种名义关税率越高,则该国对这种进口替代产品保护程度就越高。与名义关税率相比,有效关税率更准确地衡量了对某一产业的保护程度。有效关税率提示了一个产业的关税贸易保护程度 First, the theoretical basis for the determination of the level of tariff protection In theory, the measure of tariff protection on a country’s economy there are two main indicators: the nominal tariff rate and the effective tariff rate. The nominal tariff rate is the rate at which the Customs imposes a specific import of certain products. Obviously, the higher the nominal tariff rate, the higher the country will protect such imported substitute products. Compared with the nominal tariff rate, the effective tariff rate more accurately measures the degree of protection of an industry. The effective tariff rate has prompted the degree of tariff protection in an industry