the present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method . the bimodal linear block copolymer includes a hepta - block copolymer of vinyl aromatic block - conjugated diene block - tapered block - vinyl aromatic block - conjugated diene block - tapered block - vinyl aromatic block , and a tetra - block copolymer of vinyl aromatic block - conjugated diene block - tapered block - vinyl aromatic block as prepared by adding two charges of an initiator . the bimodal linear block copolymer is prepared by adding several charges of the initiator , vinyl aromatic monomers and conjugated diene monomers to acquire transparency , toughness , rigidity and flexibility , and thereby can be used for sheets or films , or injection or blow molding products .