Tariffs affect many types of photovoltaic modules, including crystalline silicon ( C - Si) Type, thin film and concentrator. In the middle of 2017, the American solar photovoltaic modules imported before tariffs announced increased investment photovoltaic power station operation but take effect in February 2018 tariffs after few months dropped to less than 300000 kilowatts. Earlier, headquartered in the United States, the two global solar manufacturers & ndash; — suniva和solarworld— — By 1974 'trade law' the 201th to the United States international trade commission to apply for import relief. This paper not only includes editor Wolfgang & middot; Dr Parr, herself, in its new energy career of more than 50 years, the deep understanding of the development of photovoltaic (pv) and system summary, also include the global photovoltaic industry professionals engaged in new energy or a review of the photovoltaic difficult development, in January 2018, solar glass curtain wall the levy customs duties on imports of silicon solar cell and components. In December 2017 to July 2018, excluding tariffs of monocrystalline and polycrystalline silicon components of the global average spot prices fell 27% and 26% respectively. The us international trade commission ( USITC) In May 2017 to solar photovoltaic products customs investigation. After become effective of duties, tax rate will be reduced 5% a year. According to bloomberg new energy finance, since mid - 2018, photovoltaic component price is relatively stable. 4 months back 2019 years ago, the American solar photovoltaic modules of imports by an average of 64. 40000 kw, and the average of the first four months of 2017 is about 16% higher than that of imports. The ground station according to the U. S. energy information administration ( EIA) Solar photovoltaic components shipments monthly data, announced in tariffs and take effect after a few months, imports fell by solar energy components. Solar photovoltaic (pv) network statement: this information is reproduced from the media or other Internet web site, network cooperation photovoltaic network published the article for the purpose of the information, does not mean that agree with his point of view or confirm its description. The tariff exemption for imported 25000 mw each year battery, substation operation, and the importation of certain developing countries. Photovoltaic power station operating content are for reference only. A sustained drop in solar pv module cost may offset the part of solar tariffs. The resulting security duties will last four years, the first year of a 30% tariff. 'Photovoltaic (pv) of the world' this is a comprehensive system to introduce the development of photovoltaic (pv) in the past, ground station and the sum of the future now corpus, backplane wide-ranging, can meet the needs of different readers.