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contemporary valve pipelines map, use GPS and RS 
technologies to obtain the digital information of 3-D 
coordinate of the valve pipelines and input into the 
database for management. 
5. Establish large-scale topographic map graphics databases 
or aerial image databases as the geographic background 
for the valve pipelines. Input into the database for 
management. 
6. Construct the whole managerial network for the Guangzhou 
duct system. 
Take warning from previous failure. To construct by stages can 
not only sum up experiences and lessons in the previous phase 
as references for the latter, but also change the reformatory 
concept of directors and staffs gradually through practice, so as 
to mitigate the resistance during the construction and smooth 
the way for the construction. 
5. CONCLUSION: 
For many years, we have been using the traditional method to 
manage the artery of city and lifeline of people - duct system. A 
large amount of human power, material resources and financial 
power is ploughed into while enormous precious freshwater 
resource is wasted. As the world economy is developing 
vigorously with a rapid increase of world population, the 
freshwater resource is more valuable even than gold for the 
human. The traditional managerial mode is lagged by the 
developing society. However, the rapid development of 3S 
technology has provided us with possibilities to scientifically 
construct and manage the duct system. We should actively 
probe into using 3S technology as an incisive point for the 
water supply industry, so as to construct and manage people's 
lifeline project scientifically. 
REFERENCES: 
1. Jianya, GONG, Theories and Techniques of Contemporary 
GIS, Wuhan: Publication House of Wuhan Technical 
University of Surveying and Mapping, March 1999 
2. Jingnan, LIU, Principles and Methods of Wide Area 
Differential GPS, Beijing: Publication House of Surveying 
and Mapping, November 1998 
3. Yingzhong TIAN, Underground Duct System Detection and 
Information Management, Beijing: Publication House of 
Surveying and Mapping, August 1997