The invention relates to a node marking method in a wireless Mesh network, including a first node transmitting connection request information; a second node returning connection response information or selecting an undistributed correlation sign to mark the connection relation and returning one connection response information; the first node judging whether the correlation sign is conflicted witha distributed correlation sign or not, if so, then retransmitting; the first node or the second node transmitting information to a correspondent node; the correspondent node searching a corresponding transmitting node from a local record according to the analyzed MAC address and searching a Mesh node mark; judging according to the mark, if no bit position is corresponding to the Mesh node mark or the corresponding bit position is set as ''no'', representing that no data is transmitted to the correspondent node; otherwise, representing that data is transmitted to the correspondent node. The invention also relates to a node marking system in a wireless Mesh network; therefore, the invention avoids a mark conflict caused by not collecting all the distributed marks of neighboring nodes.