It is the abbreviation of the school gate of the Second School, especially a classical and elegant "archway" building with blue bricks, white columns and three arches in Tsinghua University campus. The lintel is engraved with the three characters "Tsinghua Campus" inscribed by Na Tong, a great scholar in the late Qing Dynasty. Erxuemen is one of the most representative landmark buildings in Tsinghua campus, so it is often regarded as the symbol of Tsinghua University.

The Second Gate is the earliest main gate in Tsinghua, which was built at 1909.

1933, campus expansion, garden wall moving out, new gate (west gate). Since then, this earliest school gate has been called the "Second School Gate".

Spring, summer, autumn and winter, year after year, time flies, standing on the main road and the second school gate of the campus, silently witnessing the history and development of Tsinghua in the storm. It is not only a distinctive symbol of Tsinghua campus, but also a symbol of Tsinghua people's long-term hard work and pragmatic character.

The second school gate is located on Tsinghua Road, one of the main roads in Tsinghua. Standing on Tsinghua Road, looking north at the second school gate, you can see Tsinghua Auditorium, sundial and Tsinghua School.

Tsinghua University No.2 School Gate is located in Tsinghua Road, one of the main roads in Tsinghua. It is one of the most representative landmark buildings in Tsinghua campus and is considered as the symbol of Tsinghua University.

Tsinghua University No.2 School Gate is a classical and elegant "archway" building with blue bricks and white columns and three archways. The lintel is engraved with the handwriting "Tsinghua Campus" by Na Tong, a great scholar in the late Qing Dynasty. Standing on Tsinghua Road, looking north at the second school gate, you can see Tsinghua Auditorium, sundial and Tsinghua School.