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Autosamplers are now widely used in analytical instruments. In order to simplify the operation and improve the dilution accuracy, an automatic dilution control system based on a 3D sampler was designed based on the traditional sampler. The three-axis linkage positioning technology of the sampler is compensated and optimized to reduce the positioning error of the sample vial, and enhance the stability of the start and stop of the needle holder and the positioning accuracy. Add auto-empty, power-on self-test function to reduce sample impurity contamination; 485 communicates with dedicated analytical instruments such as ion chromatographs to realize online communication and reflect instrument status in real time Add automatic dilution function, add error compensation algorithm to the volume of liquid to be tested by the syringe pump, and make the dilution data more accurate. Autosampler reduces labor costs and maintenance costs. The chromatograph test shows that the linear value of the anion configuration can increase the r value to above 0.999. The effect is good and meets the design requirements.