The current experiments was conducted at Plant Production Department, Faculty of Agriculture (Saba-Basha) Alexandria University, during 2019 season to evaluate the fiber and yarn properties of combed yarns by compact and conventional ring spun yarns for three Egyptian cotton varieties (Giza 94, Giza 92 and Giza 86) which belong to long staple category under three yarn count (Ne 80's, Ne 100's and Ne 120's). The fiber properties were measured as well as yarn properties by two spinning system were made at Cotton Research Institute under comparable technological condition on RstI Marzoli ring and compact spinning fitted with Olfil system on one frame. The results showed that the compact spinning surpassed than conventional ring spinning in yarn traits i.e.  lea count strength product (LCSP), single yarn strength (cN/tex), elongation (%), CV%, thin and thick places, neps, total imperfections and yarn hairiness. as that the compact spinning recorded the higher desirable values for lea count strength product (LCSP) (2900), single yarn strength (cN/tex) (25.39) and elongation (%) (5.03). as recorded the lower desirable values for CV%, thin (16) and thick places (36), neps (68), total imperfections (120) and yarn hairiness (1.60). As well as cotton variety Giza 92 recorded the desirable values for lea count strength product (LCSP) (3030), single yarn strength (cN/tex) (25.24) and CV% (12.08). On the other side, Giza 86 recorded the better values for thin (11) and thick places (21), neps (67), total imperfections (99) and yarn hairiness (1.80). Yarn count Ne 80's gave the desirable values for above studied traits. The first order and second order interaction were significant differences for all studied traits. From the previous results it could be say that cotton variety Giza 92 under both compact spinning and Ne 80's recorded the best values for the studied characters. In general, the properties of combed yarns produced with compact spinning system are better than the those with conventional ring spinning system, compact yarns were having better tensile properties, elongation ratio and lower hairiness than conventional ring yarns, that could be due to the elimination of spinning triangle in spinning system, and the decrease from the flight of fibers of structure yarn increase and this leads to higher yarn tenacity and elongation ratio.  Also, Compact spun combed yarn was to found to have higher evenness and lower number of total imperfection values (thin places, thick places and neps). If the evenness property of compact yarn can be improved, it will have a potential for improving quality and profitability of cotton yarn manufacturing.