Let {X, X-n,n >= 1} be a sequence of identically distributed pairwise negative quadrant dependent (PNQD) random variables and {a(n),n >= 1} be a sequence of positive constants witha(n)=f(n) andf(theta(k))/f(theta(k-1)) >=beta for all large positive integersk, where 1 = 1) is a non-decreasing function on [b, +infinity) for someb >= 1. In this paper, we obtain the strong law of large numbers and complete convergence for the sequence {X, X-n,n >= 1}, which are equivalent to the general moment condition n-ary sumation Sigma P-infinity(n=1)(vertical bar X vertical bar>a(n))