  Embedding sequential computations in biochemical environments is challenging
because the computations are carried out by chemical reactions, which are
inherently disordered. In this paper we apply modular design to specific
calculations through chemical reactions and provide a design scheme of
biochemical oscillator models in order to generate periodical species for the
order regulation of these reaction modules. We take the case of arbitrary
multi-module regulation into consideration, analyze the main errors in the
regulation process under \textit{mass-action kinetics} and demonstrate our
design scheme under existing synthetic biochemical oscillator models.
