WD displacement sensor with a range of ±500mm is developed in order to measure large horizontal displacement. And the parameters analysis of WD displacement sensor are carried on using the orthogonal test method. The strain-displacement relationship of sensor is obtained. Six static parameters of WD displacement sensor are calculated. The experimental results showed that WD displacement sensor could measure the non-linear large displacement which is difficult to be measured directly by traditional electrical resistance sensor and all the static parameters are in good condition.