Dynamic viscoelasticity is measured for threadlike micelles from cetyltrimethyl‐ammonium bromide (CTAB) in aqueous sodium salicylate (NaSal) solutions at temperaturesT=25, 33, 40, and 50 °C. The CTAB concentration of the solutions is fixed atCD=0.01 M and a ratio of NaSal concentrationCStoCD,CS/CD, is varied from 1 to 41. Effects of bothCS/CDandTon frequency dependence of storage and loss shear moduli,G’(ω) andG‘(ω), are described in this paper in detail. Characteristic features of this micelle system may be summarized as (1) at 25 and 33 °C, the steady viscosity η and the mechanical relaxation time τMboth show a minimum atCS/CD∼4 that is followed by a maximum atCS/CD∼10 asCS/CDincreases. (2) The η and τMmonotonically decrease with increasingTin the range ofCS/CDfrom 1 to 20, but the maximum itself gradually disappears asTincreases. (3) The steady state complianceJeis independent ofTand decreases at lowerCS/CD. A rapid increase inJeis observed at higherTandCS/CDends. (4) An additional viscoelastic relaxation process is observed at the high frequency side. This mode appears in the same ω range independent of the salt concentration and exhibits theTdependence such as a type of the local friction factor, ηS/T. The discussion is mainly devoted to the applicability of a couple of models proposed so far.