Please, i want to travel from Harbin to Guangzhou in Feb by train

Only two normal trains operate between and they take 34h. Are you sure you can bear that? If not, take a plane instead. As for market, do you refer to the famous market in Guangzhou? Since I have no idea what products you are going to buy, here I only recommend the famous pedestrian street - Shangxiajie Street, close to Changshou Road subway station of line 1 and Cultural Park station of subway line 6, and Beijing Road, which has a subway station nearby with the smae name.