The numerical simulation on a reaction-diffusion system indicates that diff
erent patterns can be obtained by tuning the strength of parameter noise in
subexcitable media. With the increase of noise intensity, the waves sustai
ned by noise are not broken up as usual, they evolve orderly, and the perio
d of the waves decreases, the survival time of waves varies. The time inter
val of inputting noise also influences the process of pattern formation and
the survival time of waves.