The dissolution and precipitation behaviors of silicides and their influence on the microstructure and tensile properties of Ti-38644 titanium alloy were investigated. Microstructure characteristics and tensile fracture mode were observed by means of OM, SEM and TEM. The results showed that trace impurity Si promote the formation of (TiZr)₆Si₃ silicides. Silicide gradually dissolved when the alloy was solution treated at 700～900 ℃. No silicides were observed after the alloy was solution treated at 950 ℃. The strength of the alloy decreased with increasing solution temperature in the range of 800～950 ℃ due to the dissolution of silicides and the growth of β grians. When the alloy was solution treated at 1100 ℃ and aged at 750～900 ℃ for 1 h, silicides precipitated at grain boundaries. No grain boundary silicides were observed after the alloy was aged at 700 ℃ and 950 ℃. Grain boundary silicides had little influence on the strength, but decreased its plasticity significantly, the tensile fracture mode was mainly intergranular fracture.