###### Abstract  
High-modulus asphalt mixes are effective means to solve rutting problems, but they perform poorly at low temperatures. This study aims to enhance the modulus and low-temperature properties of mixes. Firstly, composite-modified asphalts and mixes were prepared by incorporating rubber powder and rock asphalt. Secondly, their mechanical and viscoelastic properties were investigated to determine the appropriate mass ratios of rubber powder and rock asphalt in asphalt to be 20% and 6%, respectively. The results show that both rock asphalt and rubber powder can enhance the softening point and viscosity of basic asphalt while reducing penetration. Furthermore, their combination significantly improves the high-temperature performance of the material. It is noteworthy that the rubber powder also improves the weakening of rock asphalt for mixtures at low temperatures. Finally, this study employs dynamic and static modulus tests, rutting tests, and beam bending tests to clarify the road properties of composite-modified asphalt mixes. The results indicate that mixes have high-modulus and water damage resistance while considering acceptable low-temperature performance. This paper not only enhances the adaptability of high-modulus asphalt in different environments but also expands its application range. and aging resistance than conventional asphalt mixtures [7]. In 2011, domestic scholars [PERSON] et al. designed AC20, Sup20, and EME20 using high-modulus additives and AH70# asphalt. The results showed that the temperature stability and fatigue resistance test results of AC20 and Sup20 were consistent with those of EME20, indicating that HMAM is a viable option for satisfying Chinese specifications [8]. The preparation of high-modulus asphalt relies on the following technical approaches: (1) using low-grade hard asphalt; (2) adding high-modulus agents to the matrix asphalt; (3) using SBS composite-modified asphalt. In 1998, [PERSON] et al. found that various SBS modifiers could significantly increase the complex modulus of asphalt [9]. In 2006, [PERSON] et al. conducted a comparative study of the rutting resistance of hard asphalt and SBS-modified asphalt. The results showed that the asphalt mixes prepared with hard asphalt met the requirements of specification for dynamic stability, but the overall rutting resistance was significantly inferior to that of modified asphalt [10]. In 2007, [PERSON] et al. found that the dynamic stability of a 30# hard asphalt mixture was lower than that of SBS-modified asphalt and higher than that of ordinary 70# asphalt [11]. In 2008, [PERSON] et al. prepared high-modulus modified asphalt using different SBS and proposed the technical concept of utilizing various SBS-modified asphalts for different types of asphalt pavements [12]. In 2011, [PERSON] et al. found that the water damage resistance and high-temperature performance of hard asphalt were significantly higher than those of A-70 asphalt, and there was a difficult balance between its high-low-temperature performance [13]. In 2012, [PERSON] et al. found that PE and SBS composite modification improved the high-temperature stability, mechanical properties, and water damage resistance of high-modulus asphalt mixes and reduced the low-temperature properties and fatigue resistance [14]. Although hard asphalt exhibits excellent high-temperature stability, it is prone to cracking at low temperatures. While SBS-modified asphalt can meet the temperature-sensitive requirements of pavement paving, its cost is expensive. Rubber powder is readily available, inexpensive, and environmentally friendly. Therefore, researchers have shifted their focus to developing rubber powder-modified asphalt with proven excellent low-temperature properties. In 2010, [PERSON] studied the fine structure and low-temperature rheological properties of modified asphalt using SEM and DSR tests.