Abstract: As one of key control systems in the nuclear reactor, the nuclear reactor power control system is complicated, and requires very high level of reliability. Usually the power control systems in old reactors are implemented by analogy technology, but the digitalized one will be more powerful and advantageous, and of course be difficult. The paper presents one solution for the digitalized power control system of an experimental reactor, and its methodologies, including the adoption of commercial computer hardware, redundant and interlocked software, strict quality assurance, final verification via partial practicality simulation experiments, with the intention to prove the digitalized power control system is practical, credible, reliable, and economical.