Abstract: In response to the system errors in a series of questions about measuring the liquid surface tension coefficient, an improved method is suggested. With automation down instead of manual to pull, the stability of process is improved ; with a pair of π wire instead of a π wire, the part with membrane becomes smooth; with the initial state of a sudden change process and compensation as measuring states, the influence of buoyancy and membrane weight is effectively eliminated. The accuracy of experiment is improved 3% by the use of impsoved method.

Key words: liquid surface tension coefficient, stability, smooth, compensation law