Side-chain liquid crystalline polymers containing both mesogenic (carbazolylmethylene)aniline and (4’-nitrobenzylidene)aniline units with various spacer groups were prepared to examine effects of the structure of spacer groups on the liquid crystalline properties. The copolymer containing (R)-(+)-2-methylpropylene as a chiral group in the spacer unit induced a smectic phase; the copolymer with a trimethylene spacer of similar length to the chiral spacer exhibited a nematic phase. Smectic phases were observed for the copolymer containing the chiral spacer group when the proportion of the carbazolyl group was in the range of 0.55-0.88. For example, the copolymer with the proportion of the carbazolyl group of 0.68 expressed the smectic phase from 88 degrees to 167 degrees C. This isotropic temperature was 37 degrees higher than the calculated value (130 degrees C) based on an assumed copolymer composition without the electron donor-acceptor interaction. Thus, it is assumed that for the chiral copolymer containing both electron donor and acceptor groups, the thermal stability and the induction of the smectic phase were caused by both the electron donor-acceptor interaction and the existence of the chiral group in the spacer unit.