Inside Nanjing University's largest research partnership: Tongji University

Behind Nanjing University's research output sits a defining relationship: 8,406 co-authored works with Tongji University (China) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 1,083 collaborating institutions across 72 countries, producing 66,459 joint works over the window, with international co-authors on 25% of output.

The collaborative work travels: its field-weighted citation impact stands at 2.93, where the world average is 1.0.

The Research Collaboration Index, the first global account of how universities actually collaborate, publishes its first full edition on Tuesday 15 September at 09:00 UK.

Every figure derives from the open global research record and is checkable at source.