I want to learn about Niemeier lattice and Leech lattice in it. I will be pleased if some one could introduce some books or Lecture notes to me.
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The standard reference is Conway and Sloane. If this is too much, you could try Wolfgang Ebeling's book "Lattices and codes A course partially based on lectures by F. Hirzebruch." Advanced Lectures in Mathematics. Friedr. Vieweg & Sohn, Braunschweig, ISBN: 3528064978. This covers Venkov's classification of Niemeier lattices, and some properties of the Leech lattice 

