N-Methylmorpholine is an important fine chemical product. It is an excellent solvent, emulsifier, corrosion inhibitor, polyurethane foam catalyst, and can also be used as pesticide intermediate. It is also used in the synthesis of surfactant, lubricant coolant, metal antirust agent, fiber treatment agent and other fine chemical products. The main synthesis methods are N-methylation method using morpholine as raw material, cyclization method using diethanolamine as raw material, cyclization method using diethanolamine as raw material and synthesis method using dichloroethane as raw material.