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Notice: Temporary Shutdown of Official WebsiteRelease: | Release time:September 01,2025 | Browse:1436

Dear Users, 

Due to scheduled network maintenance, the official website will be temporarily unavailable during the following period: • 

Maintenance Period: September 2 to September 3, 2025 • 

Service Restoration: September 4, 2025 (normal operation will resume)  

For urgent communications or inquiries during this period, please contact us via email at: nil@analysis.org.cn.
We apologize for any inconvenience caused and appreciate your understanding and patience.

Yours sincerely,

China NIL Research Center for Proficiency Testing
September 1, 2025

China NIL Research Center for Proficiency Testing

Address: #13, Gaoliangqiao Xiejie, Haidian District, Beijing

Contacts: Ms. CHEN Jinghua, Ms. YAN Dongxia