In this paper, we consider a SPR sensor based on D-type optical fiber with bimetallic combination. In pursuit of both
higher sensitivity and larger operating range, firstly, we separately analyze the influence of parameters such as the length
of coating L, the incident angle θ and the thickness of Au-coating layer d. when the optimum parameters of sensor are
determined, we analyze the performance of the sensor with different bimetallic combination consist of Au, Ag, Cu and
Al. Lastly, we can get a conclusion that the sensor with L=5mm,d=25nm, θ=88° and Au-Ag at x=0.8 can provide the
best performance in terms of the sensitivity and operating range.