Based on Jinan Doppler weather radar products and radar mosaics of North China, the linear mesoscale convective systems (LMCSs) that affected Shandong from 2012 to 2016 are generally surveyed, and the merging modes of LMCS and multi-cell storm and the evolution trend after merging are analyzed. The results are listed as follows. 1) There are 4 merging modes, A (LMCS) chasing B (multi-cell storm), A extending, A B facing, and B chasing A. 2) The distance threshold of merging between LMCS and multi-cell storm is 30 km. 3) After LMCS merges with multi-cell storm, the intensity increases or keeps, the spatial scale is enlarged, the lifespan is prolonged, and the long axis probably experiences a turn. 4) When LMCS merges with multi-cell storm, the merged part would be weakened, and the multi-cell storm merges into the LMCS, becoming part of the LMCS. 5) The merging results from the propagation of thunderstorms. 6) Thunderstorm gale, hail, or heavy rainfall occurs in 63.3% of the merging cases, and thunderstorm gale has the maximum probability of occurrence.