◆In July 1990, "Yantai Electronic Mesh Board Factory Preparation Office" (predecessor of Zhenghai Magnetic Materials Group Co., Ltd.) was established.
◆In October 1992, the infrastructure team drove the first prefabricated piles in the factory area, and the construction of the mesh panel project officially started.
◆On December 1, 1992, on the basis of "Yantai Electronic Mesh Board Factory Preparatory Office", "Yantai Electronic Mesh Board Factory" was established (formerly "Yantai Electronic Mesh Board Factory Preparatory Office (former "Yantai Electronic Mesh Board Factory Preparatory Office").
◆On February 3, 1993, approved by Shandong Province Foreign Trade and Economic Cooperation Commission, Yantai Luxin Electronic Mesh Board Co.
◆On Nov. 20, 1995, the first phase of Yantai Zhenghai Electronic Stencil Co.
◆On April 6, 2000, Yantai Zhenghai Magnetic Material Co.
◆On May 9, 2000, approved by Yantai Municipal People's Government, Yantai Electronic Stencil Factory was rebuilt into Yantai Zhenghai Group Co.
◆At 9:18 a.m. on Aug. 6, 2000, the first prefabricated pile was driven down at the construction site of Yantai Zhenghai Magnetic Materials Co.
◆In September, 2001, the third phase of the project of Zhenghai Stencil Company was successfully put into trial operation.
◆August 5, 2002, the whole production line of Magnetic Material of Zhenghai was completed, and on September 6, Magnetic Material Company successfully produced N50 series of high-performance NdFeB, which put an end to the history that China's NdFeB manufacturers could only produce medium and low-grade products.
◆In September 2002, Zhenghai Group was identified by the municipal government as the first batch of pilot units for restructuring of municipal large enterprises in Yantai.
◆On February 28, 2003, the whole restructuring of Yantai Zhenghai Group Co.
◆On Oct. 31, 2003, Yantai Zhenghai Electronic Stencil Co.
◆On October 22, 2003, Yantai Zhenghai Biotechnology Co.
◆July 8, 2004, Yantai Zhenghai Group Co.
◆On March 28, 2006, Yantai Zhenghai Pawnshop Co.
◆In September 2006, Yantai Zhenghai Xingyuan Automobile Interior Parts Co.
◆On January 25, 2007, Zhenghai Bio-technology obtained the medical device registration certificate of its first product, oral repair film.
◆On Nov. 28, 2007, the first non-shade product of Zhenghai Mesh Panel Company, LCD TV speaker mesh cover, realized batch supply.
◆July-August 2009, "Haifu" Skin Repairing Membrane and "Hai'ao" Biofilm passed the approval of the State Food and Drug Administration and were listed on the market successively.