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In this paper, global dynamics and bifurcations of a two-dimensional discrete-time Lotka-Volterra model have been studied in the closed first quadrantR    2. It is proved that the discrete model has three boundary equilibria and one unique positive equilibrium under certain parametric conditions. We have investigated the local stability of boundary equilibria   O  (  0,0  )  ,   A(    α    1    -  1  )   /α    3,  0    ,   B    0  ,    (    α    4    -  1  )   /α    6and the unique positive equilibrium   C(  (    α    1    -  1  )    α    6    -    α    2    (    α    4    -  1  )  )   /   (    α    3α    6    -    α    2α    5    )    ,    (    α    3    (    α    4    -  1  )  +    α    5    (  1  -    α    1    )  )   /   (    α    3α    6    -    α    2α    5    ), by the method of linearization. It is proved that the discrete model undergoes a period-doubling bifurcation in a small neighborhood of boundary equilibria   A(    α    1    -  1  )   /α    3,  0    ,  B    0  ,    (    α    4    -  1  )   /α    6and a Neimark-Sacker bifurcation in a small neighborhood of the unique positive equilibrium   C(  (    α    1    -  1  )    α    6    -    α    2    (    α    4    -  1  )  )   /   (    α    3α    6    -    α    2α    5    )    ,    (    α    3    (    α    4    -  1  )  +    α    5    (  1  -    α    1    )  )   /   (    α    3α    6    -    α    2α    5    ).   Further it is shown that every positive solution of the discrete model is bounded and the set0  ,α    1/α    3×    0  ,α    4/α    6is an invariant rectangle. It is proved that ifα    1    &lt;  1   andα    4    &lt;  1  , then equilibrium   O  (  0,0  )   of the discrete model is a global attractor. Finally it is proved that the unique positive equilibrium   C(  (    α    1    -  1  )    α    6    -    α    2    (    α    4    -  1  )  )   /   (    α    3α    6    -    α    2α    5    )    ,    (    α    3    (    α    4    -  1  )  +    α    5    (  1  -    α    1    )  )   /   (    α    3α    6    -    α    2α    5    )is a global attractor. Some numerical simulations are presented to illustrate theoretical results.

Global Dynamics and Bifurcations Analysis of a Two-Dimensional Discrete-Time Lotka-Volterra Model