The canteen is really a big waste. We can control the waste by posting slogans such as saving food, starting from me, etc. in a prominent position in the lobby, and promoting cheap dishes such as small dishes and half dishes. We can also take screenshots of people who don't do CD-ROM actions through video surveillance, mosaic their faces, and then scroll them on the TV screen of the canteen. But the most important thing is to train the aunts who cook well, so that they can see the figure and number of people who cook to kindly remind buyers to do what they can.