1. then it will abandon the orphane block and accept the longest chain. right ？
Yes. As soon as the node is updated with the details of a longer chain, then it will switch to that chain and abandon the stale block. 2. eventually less or no node will relay the orphane block. right ?
Also yes. Once the details of the longer chain has propagated around the entire network, then all nodes will drop the stale block and move to the longer chain.The term "orphan block" is confusing, which is why I use the term "stale block" here. Orphan blocks were blocks received by nodes which did not yet receive details of their parent blocks - hence the term "orphan" or "without parent". These haven't existed in years since a code change which causes headers to be synced first before block data. The better term for what we are discussing here is "stale block" - a block which was once valid, but has now been abandoned and turned "stale".
