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The original bottle-neck of difficulty in processing, inconsistent performances and pollution during processing of crumb rubber modified asphalt （CRMA） were summarized and analyzed from chemical engineering perspective， the source， composition and basic properties of crumb rubber were analysized， the relationship between the perpetually changing multi-networks structure and properties of crumb rubber during selection， breaking or activization， asphalt binder or mixture processing and recycle were elucidated with 69 references. The performance and optimization methods of CRMA mixture were also reviewed from engineering perspective. The development direction of CRMA was prospected and development suggestions were put forward.