［Purposes］ This paper aims to study the optimum content of each additive of low?temperature sealants and fillers so as to prolong the service life of road effectively. ［Methods］ Based on improving the preparation process of seam filling glue, different content of sealants and fillings was incorporated and then principal component analysis method was used to compare the result. The rheological, fatigue and cohesive properties of the sealant were evaluated by low?temperature bending beam rheological test, linear amplitude scanning test and viscosity test, respectively. Sebsequently, the optimum content of each additive of low?temperature sealant was obtained. ［Findings］ The optimum content of each additive of low?temperature sealant was 6% styrene?butadiene block copolymer (SBS),2% compatibilizer,2% plasticizer,12% waste rubber powder,14% stabilizer and 7% tackifier. The conventional performance indicators were arranged in descending order of importance as follows: flow value, cone penetration, softening point, ductility, and elastic recovery rate. The fatigue life of the optimal amount of sealant and filling was 2.81×109 times. ［Conclusions］ There was no consistency between additive content and fatigue life. The research results could provide a reference for studying additive content and performance of low?temperature sealants and fills.