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In 550, Gao Yang, who had become regent of Eastern Wei following the deaths of Gao Huan in 547 and Gao Cheng in 549, had Emperor Xiaojing of Eastern Wei yield the throne to him, ending Eastern Wei and starting Northern Qi as its Emperor Wenxuan. As the new emperor's brother, Gao Yan was created the Prince of Changshan. He received a number of official posts during Emperor Wenxuan's reign, and was said to have distinguished himself in his ability to govern despite his youth, and was known for his solemnity. However, he was also said to be so stern in his ways that if subordinates carried out incorrect actions, he would cane them severely. At times, he participated in military campaigns that Emperor Wenxuan personally commanded.