In view of the phenomenon of some bridges suddenly collapse in the construction process in recent years,some suggestions for accurate analysis of stress monitor of bridge s construction control were proposed.

The article introduces the key techniques in the construction monitor control of the unsymmetrical side-span pre-stressed concrete continuous box beam of Xiwuyi Canal Bridge at Changzhou section in 312 National Highway, discusses the purpose and meanings of the construction monitor control and sets forth the requirements and technical measures of the linear control and stress monitor.

Although the tradition way that using electric measurement technology dosen’t fit the concrete environment, the sensor based on fiber Bragg grating (FBG) is more suitable to the long-time stress monitoring.

In this way the blade vibration stress monitoring can be realized.

This paper introduces the stress monitoring during construction for a long span PC continuous rigid-famed bridge.

At last,alignment control requirements and measures,stress monitoring require- ments and measures,closure techniques are analysed.

The clever use of neutro-axis of the girder in the stress measurement of the long span PC cable-stayed birdge;

Research purposes: Considering the variations of flexibility,stress and geometrical configuration of large span curved continuous beam or continuous rigid frame bridge in the course of construction,the study is done on the issues of flexibility and geometrical configuration control and stress measurement.