Spider silk is a natural animal protein fiber with excellent mechanical properties. Those biological and ecological functions required during spider's life history have shaped the silk's structures and mechanical properties. Dragline produced from major ampullate gland play most various roles for activities such as walking, building web, capturing prey escaping predators, reproduction etc. Its mechanical property may be influenced by some inner and outer factors. We examined the tensile properties of draglines from spiders(Argiope amoena)of different weights, from individuals fed by different foods, and from well-fed and starved spiders, and we also compared the mechanical property of filaments from the same silk. We found that the mechanical property of draglines from different individuals of the same group and silks from the same individual varied significantly, which made us difficult to determine the influence of various conditions (different weights, different foods, and well-fed and starved). With the increase of silk diameter and the increase of spider weight, the silks had better mechanical property, and these available silks were beneficial for escape. Compared to the mechanical property of the silks from the well-fed spiders, the breaking strain and breaking energy of the silks from the starved spiders decreased, but there was no difference found at yield point. It might be an investment strategy that elasticity had precedence over plasticity when intake energy of spider was limited.