The linear electro optic measurement of poled polymer utilizing an asymmetric Fabry Perot (AFP) multiple reflection film was reported. The polymer spincoated on the high reflectivity (HR) glass was corona poled, and an asymmetric Fabry Perot film was form based on its own reflectivity and HR glass. An electro optic measuring system was established based on standing free technique of this AFP film and reflective configuration. The principle of the system was analysed in detail, and the voltage se4nsitivity about 5 mV/Hz 1/2 was obtained as 1 kHz sine input electric signals propagating on coplanar electrodes.