Abstract: A new chromatographic signal sampling system consisted of two VFCs is proposed in this article. Compared with the conventional sampling method which improves the resolution on the basis of scale changing, this system doesn't have the problem that VFC can't response rapidly with the sudden change of input signal. The system is easy to be constructed and has the properties of high accuracy and low noise. It is cheap in cost and can be applied to the sampling of various analytical chemical signals.