Measuring surface tension coefficient of liquid by Jolly scale”is a basic project in the university physics experiment，which uses the pull-out method to measure the tiny force of surface tension．Among them，it  is difficult and complex to keep the‘hree-line alignment’all the time，and the gate wire which is used in the experiment is easy to deform，which makes the artificial reading very inaccurate．In view of this situation，the  experiment is improved by changing the gate wire that is easy to deform into a rectangular card and hollow cylindrical barrel that are not easy to deform and have regular shapes．The length scale on the Jolly scale is  changed to the direct readable micro force scale，and the dynamic photography technology is adopted to accurately locate the force by slowing down．Thus this improvement reduces the operation difficulty，simplifies the experiment process，and makes the reading more accurate．