Three organic dyes include monotriphenylamine-doner dye ST-1 and bitriphenylamine-doner dyes DT-1, DT-2 were synthesized which contained cyanoacrylic acid moieties as electron acceptors，and benzene or thiophene derivatives as conjugated linker. The structures of the molecules were characterized by means of NMR，FTIR and MS．The effects of increasing the amount of donors and prolonging its conjugated linkers on the photo-physical，electrochemical and photovoltaic properties of the dyes were studied．The results indicate that DT-1 and DT-2 can effectively enhance open-circuit voltage of DSSCs due to increase the amount of triphenylamine donors. But the absorption spectrum of DT-1 is weaker in visible area, which causes a decreasing short-circuit current. However, when thiopene is replaced by bithiophene to construct the conjugated linker, the absorption spectrum of DT-2 becomes stronger in visible section, thus Short-circuit current has been improved remarkably, and exhibit highest power conversion efficiency of 3.91%.