"Don tell me what for or for what, just tell me what I should do!" It is an urgent demand that we always heard in our labs.However, the results end up being far from satisfaction when postgraduate do experiments strictly by their advisers guidance.There are many students who are completely indifferent to the theoretical hypothesis and concluding analysis of their research;even if they have read a lot of literature and repeated a lot of experiments in their daily routine.When we ask about theoretical foundations of their research, they are at a loss and can answer at all.