PURPOSE: To enable the accurate control of a sample injection amt., to enable quantitative analysis of high accuracy in a continuous flow analyzing method and to automatically analyze a large number of samples large in the irregularity of concn. corresponding to samples from a low concn. to a high concn. with the same apparatus constitution by feeding back a detection result to a samply supply system.

CONSTITUTION: In the continuous flow analyzing method injecting a sample into a continuously flowing carrier to guide the same to a detector 3 with the carrier to perform the quatitative analysis of the component in the sample, a sample container 2 is filled with a sample to be analyzed and, at first, a part of the sample is injected into the carrier from the sample container 2 to perform analysis and, when the detection peak obtained in the detector 3 is below the optimum analytical region, the injection amt. of the sample is increased and, when the detection peak obtained in the detector exceeds the optimum analytical region, the injection amt. of the sample is reduced to continuously perform analysis and the adjustment of this detection peak is repeated until the detection peak reaches the optimum analytical region to perform quantitative analysis.