Abstract: Replication management has become a hot research area in data grid.It has improved availability and fault tolerant of data in grid computing environment.This paper proposed a management strategy of the dy-nam ic replication to the datagrid on the basis of deep research of the mainstream of replication management tech-nology from trad itional datagrid.Replication management strategy contains the creation method of dynam ic repli-cation that can automatically increase replication accord ing to the frequency of the access file,the selection meth-od of replication based on the GridFTPand the replacementmethod of the replication combine with the establish-ment time,access times and file size.The simulation experiments ind icated that comparing the management strate-gy of dynam ic replication with the five kinds of replication management strategy in the OptorSim grid simulator,the new strategy exhibited much more performance advantages with the resource access relate to time.