Several linear convective storms and gust fronts triggered a damaging gale event in multiple places in Shandong on 13 June 2018. Based on conventional and intensive meteorological observation data, satellite cloud imageries, and Doppler radar data, the causes of the gale event are analyzed. The results are as follows. (1) The horizontal trough behind the cold vortex turns to longitudinal style and guides cold air to superimpose on the warm ridge in the lower atmosphere. The temperature difference between 850 hPa and 500 hPa is as high as 34.7 ℃. At the same time, the dry layer of 925-600 hPa superimposes on the nearly saturated layer from the surface to 925 hPa, resulting in a significant difference in temperature and humidity between the upper and lower atmospheres, as well as strong thermal instability. The continuous and intensified inversion layer in the lower layer helps accumulate unstable energy. The significant dry layer and the high vertical temperature lapse rate of the lower atmosphere provide favorable conditions for the entrainment and evaporative cooling process in the storm. (2) The gales in each life stage of the linear storm are caused by the downbursts in the embedded ordinary cells or supercells. The combination of downdrafts between cells increases the influence range and intensity of the surface gales. Strong gales in each life stage are accompanied by heavy precipitation and hails. The dragging of raindrops and hails is an important reason for downbursts. The maximum wind speed is positively correlated with the 5-minute precipitation, and the 5-minute precipitation reaches up to 19 mm when the extreme gust of 34.8 m ·s-1 appears at Qingdao station. (3) The primary convective cells in the southeast of Shandong are triggered successively at the surface convergence line, sea breeze front, and convective cloud street. After encountering the gust fronts, the primary convective cells are prolonged and are incorporated into the main storms, which accordingly grow stronger. The downdrafts in the storms, in turn, drive gust fronts to accelerate southward, increasing the surface wind speed. There is a mutual promotion mechanism between the gust fronts and main storms. Attention should be paid to the convection triggering action of boundary layer convergence line under high convective potential conditions.