Abstract: Dipropargyl ether of bisphenols and dichlorosilane were polymerized by the Grignard process to obtain silicon-containing propargyl ether of bisphenol A resin (PSPE-A) and silicon-containing propargyl ether of diphenyl ether resin (PSPE-O), respectively. The silicon-containing propargyl ether of bisphenol resins (PSPE) were further end-capped with diethynyl benzene to obtain the ethynylphenyl-terminated PSPE-A resin (DPSPE-A) and PSPE-O resin (DPSPE-O). The four resins obtained were characterized by proton nuclear magnetic resonance and size exclusion chromatograph. The cure reactions, thermal stability and mechanical properties of the resins were studied. The mechanical properties of the quartz fiber cloth (QF) and carbon fiber cloth (T300CF) reinforced resin composites were also examined. The results show that the synthesized PSPE resins has a high curing temperature. The curing temperature and apparent activation energy of the PSPE resins can be significantly reduced by using diethynyl benzene as the end-capping agent. The viscosity at 110 ℃ of PSPE-A and PSPE-O is below 300 mPa·s, which the latter is much lower than the former. The temperature of 5% weight loss ( T_d5) and residual yield at 800 ℃ ( Y_{r, 800 ℃}) in N₂ of the cured ethynylphenyl-terminated PSPE resin are found to be 486.3 ℃ and 75.1%, respectively. The glass transition temperature ( T_g) of the cured DPSPE is higher than 400 ℃. However, the flexural strength and impact strength of the cured PSPE resin decrease to 27.8 MPa and 3.27 kJ/m² after end-capping with ethynylphenyl groups, respectively. The flexural strength and interlaminar shear strength (ILSS) of the QF/PSPE-A and T300CF/PSPE-A composites are 461.3 MPa and 35.6 MPa, 655.2 MPa and 39.3 MPa, respectively.