A novel symmetric hybrid long-range surface plasmon polariton waveguide structure is proposed and numerically analyzed. The results show that the proposed structure provides a better trade-off between the propagation length and mode confinement. The characteristics of the mode effective index, mode width, propagation length and figures of merit of the fundamental mode supported by this waveguide structure are calculated at the telecom wavelength 1550 nm for different dimensions of the polymer ridge and relatively low index dielectric regions (RLIDRs) under the metal. It is shown that the symmetric structure exhibits an increase in the propagation length, as well as a substantial increase in the figures of merit at the maximum point of the propagation length. For these advantages, the symmetric hybrid long-range surface plasmon polariton waveguide is a good candidate for realizing highly functional density photonic integration circuits.