Beijing Metro Line 1 - Geotechnical engineering investigation, engineering survey, safety risk assessment. New China 's first subway line, length 31.04km.

New China's first subway project, but also China's own design, construction of the first subway, by us (the year for the railway soldiers) to complete the survey, measurement work. Since the 1950s to start planning, began construction in 1965, September 15, 1981 officially external operations, and then to June 24, 1992 eight-line start construction, until June 28, 2000 with the first line across the board. In 50 years of history, we have witnessed and participated in every stage of China's subway construction.