Organic and inorganic hybrid materials have been the target of the last decade. It has been reported that organic-inorganic perovskites, which have low thermal conductivity and high Seebeck coefficients, are an appeling candidate for thermoelectric materials. We prepared various structures of 1D and 2D single crystals of hybrid perovskites by turning the preparation conditions and organic molecules inserted between the perovskite layer [1], and measured thermal conductivity (k) of these crystals using the steady-state method. It was found that a 1D crystal with methyl pyridine showed 0.14 (W/mK) while that with pyridine-thiol showed 3.3(W/mK). In my presentation, the relationship between the crystal structure and the thermoelectric parameters will be determined.