The shelf life of disposable tableware processed from corn stalks is three to five years. According to the public information related to the investigation, Order No.131 "Notice on Stopping the Use of Disposable Foamed Lunch Boxes in Catering Industry" was issued in May 2111, and this white pollution source was finally banned, but in fact, foamed lunch boxes are still common in the catering market, and some small vendors are greedy for their low prices and still sell or use them after purchase.