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The seismological observation system in China achieved a rapid development during the Tenth FiveYear Plan period. The construction of the technical system of Data Backup Center for China Seismograph Network was one of the most important parts of China Digital Seismological Observation Network program, and was completed by the Institute of Geophysics, China Earthquake Administration at the end of 2007. The data center is capable of receiving and storing near real‐time continuous waveform data from more than 1000 permanent stations, and also manipulating the data, including data quality control, data format conversion, event data extraction by user order, and data download service via internet. By now we have supplied about 70 TB waveform data to over 70 research projects in more than 10 academic institutions; especially after the Wenchuan great earthquake our prompt data service played an important supporting role for relevant researches. This paper presents the technical system construction of the Data Backup Center, prompt data service for Wenchuan earthquake studies, establishment of the near real‐time automatic event‐extraction system for large earthquakes, and data service for seismological and related researches.

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