Among officials and generals who ingratiated him and had him help their advancements were Yuwen Rong, Li Linfu, Li Shizhi, Gai Jiayun (蓋嘉運), Wei Jian (韋堅), Yang Shenjin (楊慎矜), Wang Hong (王鉷), Yang Guozhong, An Lushan, An Sishun, and Gao Xianzhi.
He was posthumously granted an imperial prince title during the reign of his grandnephew, Emperor Xuanzong after his grandson Li Shizhi became chancellor.
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After Li Chengqian's grandson Li Shizhi became chancellor during the reign of Li Chengqian's grandnephew Emperor Xuanzong, he often spoke to Emperor Xuanzong in defense of his grandfather.