It's blue, which symbolizes technology! 

As the national innovation demonstration zone, many new technologies and high-tech companies are created and developed at Optics Valley. It is becoming a cradle for a larger technological innovation cluster.

[Photo provided to chinadaily.com.cn]

[Photo provided to chinadaily.com.cn]

[Photo provided to chinadaily.com.cn]

[Photo provided to chinadaily.com.cn]

[Photo provided to chinadaily.com.cn]

[Photo provided to chinadaily.com.cn]