Sijichang Business Wholesale City. According to the news of Haikou roasted cold noodles, the wholesale point is in Sijichang Trade Wholesale City. The address is Wenming Road, Meilan District, Haikou City, Hainan Province. Grilled cold noodles, one of the special snacks in Heilongjiang Province, originated from Mishan City, Jixi City, Heilongjiang Province. At first, there were many ways to roast cold noodles, including frying, high-temperature iron plate rolling, etc., and then it was improved into iron plate block frying.