This study is a quasi – experiment research two groups measured before and after treatment Objective to study Effect of Stretching Muscles With the Ergonomic Risk Perceptions for Increasing Muscle Strength and Reducing Neck and Lower Back Pain in the Sewing Workers Tambon RongFong , Amphoe meuang , Phrae Province. Sample sewing professionals group Phrae province. Female 60 people Determining sample size by the formula ratio hypothesis test Group by simple random sampling into an experimental group and a control group, 30 samples. The population characteristics are similar Experimental group received stretching your muscles stretch over a period of 8 weeks with the perception of risk factors in ergonomics while the control group received the knowledge of the risk factors only Correlation analysis between groups by using the statistics Independent t-test within the group were Paired t-test