If suitable anticorrosive substances are adopted such as alkali proof concrete,steel and PVC cement and effective measures taken,they will prevent the building from alkali corrosion.

Several mistakes of protection of materials are analyzed about protection of galvanic corrosion and potential control of cathode protection and measure of cathode protection.

Monitoring the material decay make use of the technique of video,computer image processing and pattern identify to detect,process and manage the external material decay image.

The original value monitoring for material decay is to make use of the video frequency technique,the computer image processing technique and mode identification technique for examination,processing and management of decay image of the material external appearance.

Material decay monitoring,using techniques of video,computer image processing and pattern identification,detects,processes and manages the external material decay image.