The present disclosure provides a mapping and resource allocation method for R-PDSCH, including: when resources allocated for an R-PDCCH overlap with resources allocated for the R-PDSCH, data of the R-PDSCH is not mapped or sent on over-lapped resources, or the data of the R-PDSCH to be sent on the over-lapped resources is punctured; the data of the R-PDSCH is mapped and sent on all or partial resources which are not occupied by the R-PDCCH; a receiving end receives data according to the mapping method for the R-PDSCH; wherein a resource allocation mode corresponding to a shared channel in an LTE system is reused or a grouping-tree resource allocation mode is used to allocate resources for the R-PDSCH. The present disclosure is well applicable to a link between an eNode-B and a relay node, and the resource allocation mode is flexible, the signalling overhead is lowered, therefore, not only the backward compatibility is ensured, but also the problem of mapping and resource allocation of the R-PDSCH is solved.