He is the former head of the financial department of Liaoning Yipin Law Firm, a member of the expert group of the Liaoning Law Association on the interpretation of the Civil Code, and a member of the Finance Committee of Dalian Lawyers Association.

Wei Haonan has been engaged in the disposal of non-performing assets such as Great Wall Assets, Oriental Assets, Xinda Assets, Detai Assets, etc. He has acted for ICBC, Great Wall Assets, Oriental Assets, Dalian Bank, Dalian Agricultural and Commercial Bank, Ping An Bank, Harbin Bank, Xinhui Village Bank, Dandong Bank and many other financial institutions in hundreds of litigation cases and thousands of due diligence investigations; he has acted for Sinotrans Regulatory Contract Dispute Series Ltd. and its subsidiaries, Dalian Tianbao Green Food Co. Ltd., Dalian Baoshan Garment Co., Ltd., Dalian China Sugar, Zhangjiagang Jinxin Investment Company, etc.