I am going to Cheng du for 5 weeks, may i know what are the food prices there?

If you just eat the regular food there, CNY20-30/day is enough. You can really find many tasty food and snacks there, so you may spend some money on that. By doing so, your daily expense may be a little higher. In this case, CNY50-60/day is enough. If you go to a good restaurant with your friend, one dinner may cost you around CNY100.