2015年伊核协议达成以后，伊欧关系迅猛发展，双方高层之间的互动频繁，经贸关系迅速增长。伊朗崇拜欧洲的生活方式，将突破对欧外交视为其外交破局的关键，而欧洲国家将伊朗视为重要的潜在市场和中东战略的重要伙伴，这些都构成了伊欧关系发展的重要动力。伊欧关系发展也受到多重因素的制约，包括美伊敌对关系、双方地区战略上的分歧以及意识形态上的差异等。伊欧关系发展对中伊关系发展造成了消极影响。中伊政治关系并未在伊核协议达成以后取得积极进展，原因部分在于伊欧关系发展削弱了中国对伊朗的战略重要性；中伊经贸关系不升反降也在很大程度上反映了伊欧关系的发展。
Iran's relations with EU had grown greatly after the JCOPA was reached and implemented. The high-level exchanges between the two had become more frequent，and economic relations between the two had grown rapidly. While Iranian admire European lifestyle and attach great importance to its relations with EU，European states regard Iran as a big potential market and a major partner in Middle East regional affairs. These are the driving forces behind the development of Iran-Europe relations. Iran-EU relations were also facing restrictions including U.S.-Iran hostility and the discrepancy between Iran and Europe in ideology and Iran's regional policy and missile program. Iran-EU rapprochement had produced negative impact on China-Iran relations. Neither political nor economic relations between China and Iran had improved since the JCPOA was reached. The reasons should be numerous，and one of them should be the impact of Iran-EU relations.
