Does the subject want to ask "what is the relationship between Du and Mao Xiaolian of the engineering company"? Colleague relationship. By the end of June 5438+February 26, 2023, according to the official official website of Shaanxi Water Diversion Project Construction Co., Ltd., Du was known as the former Party Secretary and Chairman of Shaanxi Water Diversion Project Construction Co., Ltd., and Mao Xiaolian was known as the former Deputy Secretary of the Party Committee, employee director and trade union chairman.