The invention provides a chemical vapor deposition method, which takes liquidoid organic precursor as the carbon source and the nitrogen source, adopts an injection pump to inject the precursor into a reaction chamber, regulates the variety and input of the precursor, the variety and load of catalyst, the flow speed of protective atmosphere, and the reaction temperature, so as to produce high-quality carbon nano-tubes of different sizes and appearances, or nitrogen-mixed carbon nano-tubes with different nitrogen contents, classes, sizes and appearances in large quantity. For the chemical vapor phase deposition method of the invention, the carbon atoms in the precursor are transformed into carbon nano-tubes or nitrogen-mixed carbon nano-tubes with the transformation rate up to more than 60%, and the nitrogen content in the obtained nitrogen-mixed carbon nano-tubes is comparatively high; the diameter of the obtained tubes is comparatively uniform and the purity is relatively high; by adopting the CVD method to produce carbon nano-tubes or nitrogen-mixed carbon nano-tubes, the chemical vapor deposition method in the invention has the advantages of easy feasibility, convenient control of the reaction conditions, and no special requirements on the physical properties of the precursor by adopting the injection pump to inject the precursor, and larger selectable range of the precursor.