  In this article we study a constant-roll inflationary model in the context of
brane-world cosmology caused by a quintessence scalar field for warm inflation
with a constant dissipative parameter Q =$\Gamma$/3H. We determine the
analytical solution for the Friedman equation coupled to the equation of motion
of the scaler field. The evolution of the primordial scalar and tensor
perturbations is also studied using the modified Langevin equation. To check
the viability of the model we use numerical approaches and plot some figures.
Our results for the scalar spectral index and the tensor to scaler ratio show
good consistency with observations.
