A ring R is said to be left pure-hereditary (resp . RD-hereditary) , if every left ideal of R is pure-projective (resp . RD-projective) . hereditary rings , are given . Also , it is shown that if R is a left RD-hereditary left nonsingular ring , then R is left Noetherian , if and only if R is a left FGF , left Coherent , right pure-injective ring . \\\\ A ring R is said to be left FP-hereditary , if every left ideal of R is FP-projective . Also , if R is a left CF ring , then R is Noetherian , if and only if R is left pure-hereditary , if and only if R is left FP-hereditary , if and only if R is left Coherent . Also , it is shown that every left self-injective left FP-hereditary ring is semiperfect .