The command post will be set up from 7 a.m. to 7 p.m. at the corner of Sabourin Crescent and Stravinski Avenue in Brossard.
A $5,000 reward is also being offered by Sun Youth care of an anonymous donor for information leading to their discovery.
Li and Xiofeng were reported missing last Wednesday by her husband, who left the family home at 9:40 a.m. the morning of April 30. When he returned at 2:30 p.m., both she and their son were gone.
According to Longueuil police, Li left behind her ID, money and other personal effects, as well as the baby stroller. She left either on foot, or was picked up or taken.
Li is of Asian origin and has shoulder-length black hair and brown eyes. She is 4-feet-9-inches tall (1.52 metres) and weighs 143 pounds (65 kilograms). She wears prescription glasses and was possibly wearing a long black coat and yellow sneakers when she left home. She speaks Mandarin, as well as English and French.
Anyone with information on her and her son’s whereabouts are asked to call 450-463-7211.