Depends on who you're frying the tofu with or whether it's old tofu. If it's watery tofu, you should bring the oil to a rolling boil to see if there's smoke coming out as a standard. Then put it in, it is best to stir fry less, because water tofu easy to fall apart. If it is old tofu, you should put a little more oil, also to have hot, and then put in, to keep stirring, easy to stick to the pan. Generally when you stir-fry, the seasonings are put in when the dish is cooked to seven or eight minutes, and the first thing you put in should be salt. When the oil boiled, you put the vegetables to put gently, do not be afraid to splash open and thrown in, so that the oil instead of splashing open, frying for fear of oil splash open, you have to bring a good protective equipment first.