Dependence of physical properties on manufacturing conditions of cotton elastic braid made of core latex rubber thread were studied experimentally. The results as follows; 1) Breaking strength had little effect on braiding angle($ heta$a), and elongation was proportional to tan $ heta$a. 2) Relation between limiting elongation and strain ratio of core latex rubber thread showed a linear function of which slope coresponds to a draft ratio in manufacturing process(Da). 3) Tensile stress was depended on $ heta$a. 4) Stress relaxation behaviour of the elastic braid satisfied the stress relaxation equation of polymerec elastomers as shown below. ln ft=lnfto-K ln n Where K values, rate of stress relaxation of the elastic braid, can be expresses as; K=(0.1101-0.7763u)k When considered the strain ratio of rubber thread, from this equation, calculation of the stress relaxation rate(k) of rubber thread enables the estimation of tensile stress at any time.