Two types of the main chain type liquid crystalline polymer were synthesized and measured ionic conductivity, One of the polymers exhibited a smectic phase. The mixture with lithium salt at the ratio of 0.04 per repeating unit also exhibited a smectic phase. However, the mixture with lithium salt (0.11) showed a nematic phase. Ionic conductivity of the mixture with lithium salt (0.11) was larger than that of the mixture with lithium salt (0.04). The trans type polymer exhibited a liquid crystalline phase, while the cis type polymer didn't show. We found that the ionic conductivity of the trans type polymer with lithium salt mixture (0.11) was larger than that of the cis type polymer with lithium salt mixture (0.11) Moreover, the ionic conductivity of the ceramic-polymer with lithium salt composite was larger than that of the ceramic-free polymer with lithium salt. The other polymer showed a nematic phase. The mixture with lithium salt (0.04) or (0.11) also exhibited a nematic phase, Ionic conductivity of the polymer with lithium salt mixture (0.11) was smaller than that of the polymer with lithium salt mixture (0.04).