NOVELTY - Utilizing pressure of natural gas to partially liquefy natural gas includes allowing a high pressure pipe network of the first natural gas to enter the dewatering heavy hydrocarbon system, carrying out dehydration de-heavy hydrocarbons, dehydrating a heavy hydrocarbon system to liquefying system of refrigeration air as regeneration gas, and cooling gas regenerating a depressure pipe network downstream natural gas system, heating, cooling and liquefying.    USE - Method for utilizing pressure of natural gas to partially liquefy natural gas (claimed).    DETAILED DESCRIPTION - Utilizing pressure of natural gas to partially liquefy natural gas comprises allowing a high pressure pipe network of the first natural gas to enter the dewatering heavy hydrocarbon system, carrying out dehydration de-heavy hydrocarbons, reducing natural gas normal pressure dew point to less than or equal to - 76 degrees C, where the heavier hydrocarbon components are greater than or equal to 6C and less than or equal to 217 ppm, dehydrating a heavy hydrocarbon system to liquefying system of refrigeration air as regeneration gas, and cooling gas regenerating a depressure pipe network downstream natural gas system and dividing heavy hydrocarbon into liquefied gas circuit and gas circuit which enter into carbon removing system. The carbon dioxide (CO2) is removed to less than 70 ppm, carbon removing system to liquefying system steam as gas, steam regenerating a removing pipe network pressure downstream and enters the main heat exchanger through the liquid gas after decarburization is cooled to - 85-142 degrees C, throttling through the throttle valve to 0.3-0.6 MPaG and entering into a gas-liquid separator, gas-liquid separator liquid phase that is a liquefied natural gas, liquefied natural gas storage tank, the liquefied steam from the gas-liquid separator top part returning to the main heat exchanger reheating to normal temperature, as regenerated gas carbon removing system, after the regeneration removing pressure, from the dewatering a heavy hydrocarbon system refrigerant gas circuit enters the liquefied system heat exchanger and - 25 to - 55 degrees C and the main heat exchanger, the expansion end of the high temperature expansion machine, providing the heat exchanger, at the same time by reheating to room temperature, then boosting end of the high temperature expansion, then cooling to normal temperature and then entering the main heat exchanger to - 30 to - 70 degrees C, the expansion end of the low-temperature expander, the expansion end of the gas phase and then returning to the main heat exchanger to provide cooling, at the same time, by reheating the boosting end of lower temperature expander to normal temperature and 0.3-1 MPaG, cooling to normal temperature and liquefying system. The refrigeration gas liquefying system is divided into three paths. In the first path, a heavy hydrocarbon system dewaters a heavy hydrocarbon system of the regeneration gas. In the second path, a heavy hydrocarbon system finishes the regeneration and the regenerated gas dehydrating and removing system complete regeneration of the regeneration air collecting de-pressure pipe network. The third circuit is used as recycle gas removing circulating air loop, and returning a heavy hydrocarbon system inlet through the circulating gas compression system. An INDEPENDENT CLAIM is included for a device for partially liquefied natural gas via natural gas pressure energy comprising a dehydrating removing heavy hydrocarbon system, a carbon removing system, a liquefying system and a circulation gas compression system.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram of the method for utilization of pressure of natural gas to partially liquefy natural gas (Drawing includes non-English language text).