Fishplate is a kind of significant component connecting with fastener in the rail joint area of the railway track system. The function of the fishplate is to keep the steel rail in correct position on basis of equal length of rail bearings and reliable connection between steel rail and rail bearing, preventing steel rail from moving in transverse and longitudinal directions, providing certain elasticity for the rail structure to decrease vibration and delay the residual deformation accumulation for the rail, bearing the loading when train passes and the complex stress effects including pressure, bending force, shear force, and fretting wear, etc. According to the functions, the fishplate is divided into cemented fishplate, irregular fishplate and normal fishplate.

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