Abstract: In order to evaluate the relaxation characteristics of T9A spiral compression spring at room temperature, the accelerated stress relaxation test of T9A spiral compression spring was carried out at different temperatures with a small tonnage electronic universal material testing machine, and the relaxation behavior was studied. Based on the viscoelastic model, the transformation characteristics of elastic strain to plastic strain and the change rule of plastic strain with relaxation time were revealed. The results show that the stress relaxation behavior of the spiral compression spring is similar to that of the standard metal, and it can be divided into two stages. Ambient temperature has a significant effect on the relaxation rate in the second stage. Based on the thermal activation characteristics of stress relaxation process, the storage life prediction equation of T9A spiral compression spring was established, and the storage life of spring at room temperature was reasonably predicted: under the condition of maintaining 125 N compression load, the spring can meet the requirement of 20-year storage life (load loss rate ∆P/P<12%) at the room temperature of 25 ℃.