Polyketone fiber, a newly developed high strength fiber, has a tenacity and modulus similar to the p- aramid fiber, and can be used for reinforcing mechanical rubber goods(MRG), such as tires, hoses, and technical textiles. In addition, aliphatic polyketone, which has excellent strength, modulus, chemical stability and reasonable price, is being developed only in South Korea. It will be expected for replacement of super fiber such as aramids and increasing the technical textile market share. This paper surveys the mechanical properties of polyketone fiber yarn for technical textiles. For this purpose, two kinds of yarns are prepared, mechanical properties of coated and uncoated polyketone yarns such as tensile strength, elongation and modulus were examined before and after weather resistance test(temperature 60℃, humidity 60%, amount of power 0.67w/m2). The differences of mechanical properties between uncoated and coated yarns for high functional technical textiles and composite materials are estimated through this study.