The present invention provides an ionically cross-linkable alginate-grafted hyaluronate compound containing alginate and hyaluronate, the alginate and the hyaluronate forming a covalent linkage. The use of the compound can easily provide a cross-linked hyaluronate by adding a divalent cation without using a chemical cross-linking agent. The present invention also provides a method for cell transplantation that includes preparing a composition comprising the compound of claim 1 and cells for transplantation, and administering to a subject in need thereof the composition.
