In this paper, properties of both % 100 cotton ring spun and compact spun yams in Ne 30 and Ne 40 yam counts from the same raw material were investigated. Single Jersey, rib and interlock knitted fabrics were produced from these yarns. Weights, bursting strengths and pilling tendencies of these fabrics were investigated. The differencies of ring and compact yams were evaluated with the help of undependent two sample t test, effect of parameters used in experimental studies were evaluated with the help of oneway-variance analyze (ANOVA). With respect to experimental results, statistically meaningfull differences are determined between the measured all properties of ring and compact yams, especially in Ne 40. Differences in yam structure affected fabric properties, especially, knitted from compact yarns have higher bursting strength than fabrics knitted from ring spun yarns.