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This paper firstly analyzes the influences of low load condition on natural gas treatment unit from two aspects: the low load condition can lead to surging, as well as yield decline, which directly affects the economic benefits. Secondly, aiming at the harm of units at low load condition, according to the experience formula of expansion refrigeration and throttling expansion, the methods, such as improving the processing capacity, the expansion ratio of expansion machine, and the throttle effect, and increasing the auxiliary refrigerating capacity, etc, are used to reduce top temperature of methane tower, so as to improve the unit yield. These measures have certain reference significance to the operation of similar natural gas treatment plant. [ABSTRACT FROM AUTHOR]