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In order to solve the problem of Multi-Mode Resource Constrained Project Scheduling Problem (MMRCPSP), this paper suggests Genetic Algorithm (GA) by hierarchical coded. In the first layer, the chromosomes are used to choose the activity sequence. In the second layer, the chromosomes are used to decide the combination of activity modes. The chromosomes produced by the Activities Resource Competition Relation (ARCR) are coded by binary code. That is to say, the subsequent operation will bedoi:10.1016/j.phpro.2012.02.323 fatcat:xr5acmxkergildxxidmsgp3wna