Pipetting system

A pipetting system comprises a transfer device, a reaction chamber and a collection device which can be detachably locked, and the transfer device comprises a piston assembly, a pipette and a dosing assembly. Part of the piston assembly is sealed in the pipette and can move relative to the pipette, and the dosing assembly can add chemicals into the reaction chamber. The transfer device and the collection device are locked, the piston assembly moves away from the collection device, and the pipette sucks a to-be-detected sample; the transfer device is locked with the reaction chamber, the piston assembly moves towards the reaction chamber, and the to-be-detected sample is released into the reaction chamber by the pipette; adding a medicament in the dosing assembly into the reaction chamber to form a mixed solution, moving the piston assembly away from the reaction chamber, and sucking the mixed solution by the pipette; and the transfer device transfers the mixed solution to a nucleic acid detector for detection