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Group key agreement (GKA) is one of the key technologies for ensuring information exchange security among group members.While GKA is widely used in secure multi-party computation,safety of resources sharing,and distributed collaborative computing.It still has some security flaws and limitations.We proposes a Blockchain-based dynamic Group key agreement (BD-GKA) protocol.In contrast to prior works,BD-GKA differs in several significant ways: 1) anonymous identity authentication- it can prevent privacy leaks; 2) traceability-it can track illegal operating entities; 3) load balancing-it balances computation and communication to each node,avoiding the breakdown of single-point and network bottlenecks.This protocol is proven secure under the hardness assumption of decision bilinear Diffie-Hellman.The performance analysis shows that it is more efficient than the referred works.