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The volt-ampere （Ⅰ-Ⅴ） characteristics of the c/s-poly （phenyl acetylene） （PPA） of cis-transoidal structure has been studied in the temperature range of 253-288K. An ITO/ PPA/ Au sandwich configuration was used for the measurements. Under an applied field of less than 10

5

V/ cm it showed ohmic behavior

while the space charge limited current （SCLC） was observed at applied fields above 5×10

5

V/ cm. In the ohmic region a conductivity of 1.37×10

-16

S/ cm was obtained at room temperature with an activation energy of 0.5eV. These data indicate that the conduction is not intrinsic one but is the result of thermal release of trapped carriers. In fact the data in the SCLC region treated according to the theory for a single Gaussian distribution of traps gave a mean trap energy of 0.48 eV with a half-width of 0.4 eV and a total density of trapping states of 5×10

16

/cm

3

.