The thermodynamics and weak cosmic censorship conjecture in Reissner-Nordstr$ddot{o}$m anti-de Sitter black holes are investigated by the scattering of the scalar field. The first law of thermodynamics in the non-extremal Reissner-Nordstr$ddot{o}$m anti-de Sitter black hole is recovered by the scattering. The increase of the horizon radius indicates that the singularity is not naked in this black hole. For the near-extremal and extremal black holes, the validity is tested by the minimum values of the function $f$ at their final states. It is found that both of the near-extremal and extremal black holes can not be overcharged. When $omega=qphi$, the final state of the extremal black hole is still an extremal black hole. When $omega eq qphi$, it becomes a near-extremal black hole with new mass and charge.
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