Experimentation has been extended to almost every subfield of economics,including microeconomics and macroeconomics.Since the 1980s,economists have come to increasingly rely on experiments to explain and predict economic phenomenon.However,it takes mainstream economists dozens of years to turn their attitude from questioning and rejecting to accepting and supporting.This was partly due to the great efforts exerted by experimental pioneers,but more important was a result of the paradigm shift that occurred in economics in 1980s when the dominant position of General Equilibrium Theory was challenged by alternative theories such as Game Theory,Industrial Organization,and Public Choices,etc. Nevertheless,many critics are calling into question the artefact,reality,validity,especially external validity of laboratory experiments.Lab experiments,indeed,are not the solution to every question,especially those questions that involve interactions among hundreds of thousands of people or involve context-dependent variables that could not be randomized.But there are many types of questions and theories that are not specific to a group of people or a place or a context.Lab experiments are an excellent tool for these questions.It's noteworthy that the uprising of field experiments in the last decades has offset the weakness of lab experiments to a large extent.When feasible,the natural field experiment is an ideal kind of experiment that combines the advantages of both lab experiments and natural experiments because the subjects do not know that they are participating in an experiment. Experimental economics is developing quickly.However,it is not driven by criticisms and pressure from outside,but largely by the interaction of experiment and theory from inside,especially from the interdisciplinary interaction between the sister subfields of experimental economics and behavioral economics.Although they have different emphases,the divide between them is increasingly narrowed.Experimental economists and behavioral economics(and psychologists) are recently increasingly interested in thinking about the same kind of questions.Indeed,some researchers would find it difficult to classify themselves into one group or the other.They start to learn from each other and employ the cumulative knowledge of both subfields in their research.The emergence of Neuro-economics is a typical example.Neuro-economics is an area that bridges the fields of psychology,economics and neuro-science.It is question and interest,not method,that direct the development of this subject. Experimental Economics could certainly play an important role in the development of China,both in theory and practice.This is not only reflected in the commonplaces of experimental economics,namely,testing theory,searching for rule,and whistling besides the ears of princes,but also in the sense that it provides a good opportunity for us to develop theories and to design mechanisms that are context-dependent by solid empirical study.