Due to a national highway widening excavation was carried out near the pile ZZ034G 2 of Zhangzhou section of Fujian LNG gas transportation trunk line, an artificial high and steep slope was formed there; and the slope was partially collapsed and a wide extensional crack appeared at the top of the slope for the impact of rainy season and poor geological conditions, which was a serious threat to the safe operation of the gas pipeline at that place. According to the engineering geological conditions and exploration results, the slope treatment was divided into two sections. A variety of reinforcement measures of earthwork backpressure, anti-slide pile, anchor, lattice beams and retaining wall were taken for the slope treatment, interception ditch and drainage hole were set and information construction and slope monitoring technology were adopted with good effects in slope treatment.