In　this　work,　we　first　modify　a　Lotka-Volterra　predator-prey　system　to　incorporate　an　opportunistic　predator　and　weak　Allee　effect　in　prey.　The　prey　will　be　extinct　if　the　combined　effect　of　hunting　and　other　food　resources　of　predator　is　large.　Otherwise,　the　dynamic　behaviour　of　the　system　is　extremely　rich.　A　series　of　bifurcations　such　as　saddle-node　bifurcation,　Hopf　bifurcation,　and　Bogdanov-Takens　bifurcation　can　happen.　The　validity　of　the　theoretical　results　are　supported　with　numerical　simulations.