LNG engine is now widely used in all kinds of traffic tools, especially buses. Compared to fuel engines, the LNG engine can significantly reduce the emission of pollutants, but there is excessive emission of HC,CO and NOx in actual application of LNG engines. In this paper, aiming at over standard discharge problem of partial LNG buses in Nanning City, combined with LNG combustion characteristics and pollutant formation mechanism, reasons of excessive emission of LNG buses were discussed and analyzed.%LNG发动机现已广泛使用在各类交通运输当中，尤其是应用在公交车等公共交通工具上。LNG发动机相比燃油发动机能够大幅度减少污染物的排放，但在实际使用中LNG发动机仍存在HC、CO、NOx排放超标情况。针对南宁市部分LNG公交车排放超标的情况，结合LNG燃烧特性和污染物生成机理，类比点燃式发动机，对LNG公交车排放超标原因进行探讨分析。
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