We present in the work two intriguing results in the entanglement
classification of pure and true tripartite entangled state of 2×M×N under stochastic local operation and classical communication. (i) the
internal symmetric properties of the nonlocal parameters in the continuous
entangled class; (ii) the analytic expression for the total numbers of the true
and pure entangled class 2×M×N states. These properties help
people to know more of the nature of the 2×M×N entangled system.Comment: 12 pages, 5 figure