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Based on El-Nabulsi-Birkhoff fractional equations, Mei symmetry and corresponding new conserved quantity as well as the Noether conserved quantity deduced indirectly by Mei symmetry are studied under the framework of El-Nabulsi s fractional model.Firstly, the definition and criterion of Mei symmetry are given for the El-Nabulsi s fractional Birkhoff system.Secondly, the new conserved quantity led directly by Mei symmetry is presented.