In our project report we have studied the various aspects of Zero Divisor graph of a commutative ring Z_n by D.F. Anderson, P.S. Livingston, The Zero Divisor Graph of a Commutative Ring J. Algebra 217(2), 434-447 (1999). In this project report we have found degrees of Γ(Z_n ) for various values of n. For any integer n≥1 zero divisor graph of a commutative ring denoted by Γ(R) defined by considering all the non-zero Zero-Divisors of R as vertices and any two distinct vertices are adjacent if and only if their product is zero.