This study surveys the tension differences between Textec and Vamatex looms and analyses fabric mechanical properties using KES-FB system according to warp and weft tension differences. Fabric is designed as 5 harness satin weave using 150d/48f warp and 200d/384f weft polyester filaments, and is woven by $Omega^{circledR$-Panter rapier loom by Textec Co.Ltd and P1001es rapier loom by Vamatex Co.Ltd., respectively. These grey fabrics are processed on the same dyeing and finishing processes. Weavability is also analysed by measuring warp tension variation according to the warp position. The relationship between shed amount and the warp tension on one fixed heald frame is surveyed, and the relationship between end breaks and warp and weft tensions is also discussed.