The corrosion behavior of environmental barrier coatings (EBCs) directly affects the service life and stability of ceramic matrix composite (CMC) structural parts in the aero-engines. The silicon carbide (SiC) whisker toughening phase and c-AlPO₄ bonding phase are firstly used to improve the service life of novel tri-layer Yb₂Si₂O₇/mullite/SiC EBCs in the burner rig test. The formation of penetrating cracks in Yb₂Si₂O₇/mullite/SiC coating caused the failure of coating at 1673 K. The SiC whiskers in mullite middle coating significantly inhibited the formation of penetrating cracks in Yb₂Si₂O₇/mullite/SiC coating, and efficiently prevented the oxidation of carbon fiber reinforced silicon carbide (C_f/SiC) samples for 360-min thermal cycles (24 times) with a weight loss of 6.19×10⁻³ g·cm⁻². Although c-AlPO₄ particles further improved the service life of SiC_w–mullite (SM) coating, the overflow of PO_x gas aggravated the formation and expansion of cracks in the Yb₂Si₂O₇ outer coating, and caused the service life of overall Yb₂Si₂O₇/c-AlPO₄–SiC_w–mullite (ASM)/SiC coating to be slightly lower than that of Yb₂Si₂O₇/SM/SiC coating. This study guides the design of modified tri-layer EBCs with long service life in high-temperature and high-speed gas environment.