Abstract: In the present paper,a study of the so called "Gold beaters skin" hygrometric membrane made by the authers is given.When cut in strips of 1-1.5 mm in vaidth,experimental results in the laboratory and upper air sounding data show that: 1.The force applied on each strip must be less than 5 gms.,or other wise the calibration will be unstable.2.If an element is in habit of certain tension,the calibration will be changed when the tension is changed.3.The relztion between elongation and relative humidity follows the so-called "Gay-Lussac" scale generally,but by special treatment a linear relationship may be obtained.4.It gives large hysterisis cycle and the hysterisis phenomenon will be entirely removed as soon as relative humidity reaches 70-75%.5.The calibration will be changed when the element is covered with a film of water.The above stated properties also pocess some of other kinds of orgsnit hygrometric clements,but beside these we found that: 6.Our elements are very sensitie at low temperature and have,very small lag coefficient comparable to that of Frankenberg hair(fig.5) using in Western Germany.Because of this small lag coefficient,our hygrometric element may be proved useful in serological rieasurements.Comparison between upper air sounding data obtained by using ordinary hair,Frankenberg hair and our elements on selected weather situations in Peking are also discussed.