  It is challenging task to detect and measure genuine multipartite
entanglement. We investigate the problem by considering the average based
positive partial transposition(PPT) criterion and the realignment criterion.
Sufficient conditions for detecting genuine tripartite entanglement are
presented. We also derive lower bounds for the genuine tripartite entanglement
concurrence with respect to the conditions. While the PPT criterion and the
realignment criterion are powerful for detecting bipartite entanglement and for
providing lower bounds of bipartite concurrences, our results give an effective
operational way to detect and measure the genuine tripartite entanglement.
