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Recently, one of major problems in automotive industry is squeak noise between two different materials. It is the most severe case that the noise between automobile seat and other relative parts (or within seat parts). Especially, seat covering is generated to unfavorable sound by friction of other parts. The purpose of this research is to verify and suggest a way to reduce squeak noise between seat covering and plastic at relative parts. Test results were reported with 1 to 10 Risk Priority Number (RPN) which was proposed by VDA (Verband der Automotilindustrie). It was conducted as a test with two different types of seat trim cover (knit) and plastics (PC+ABS) applied at arm rest in automotive interior. Through the principle test, the knit were more advantageous for squeak noise than other fabrics around relative part of seat particularly with suede, tricot and PC+ABS. We also optimized the concentration of soft agent in knit for slipping through stick-slip test to moderate noise.