The objectives of this study were to determine the effectiveness of muscle stretching exercises with ergonomics training to relieve back pain and increase back pain muscle strength in hand weaving workers, Mae Rang sub-district, Pa Sang district, Lamphun province. The study of hand weaving workers Mae Rang sub-district, Pa Sang district, Lamphun province members of 30 people divided into 2 groups including experimental group (Ban Don Luang hand weaving workers) member of 15 people to muscle stretching exercises with ergonomics training and control group (Ban Nong Nguak hand weaving workers) member of 15 people to ergonomics training only. Collected data were divided into 2 parts: 1) General information, Working environment information and the feeling back pain information was performed using questionnaires. 2) Back pain muscle strength test was performed using Back Dynamometer data were analyzed by Mann-Whitney U Test to compare the feeling back pain and Back pain muscle strength between experimental group and control group using Wilcoxon Signed - Rank Test to compare the feeling back pain and Back pain muscle strength before and after program that level of confidence 95%.