| Problem solving is not only a productive activity process, but also an advanced learning process. The study on students' problem solving is beneficial to help the students experience and understand the process and method of scientific research, form the permanent learning ability, cultivate their critical thinking features and form their innovation spirits and practice abilities.The objects of this article are high school students in Jiangsu province, and we've based on the high school chemical problem solving, using reference analysis, questionnaire investigation, sample analysis and think-aloud method etc to study the current situation of students' chemical problem solving, investigate the process and features of students' chemical problem solving and analyze the problem representation and the action in problem solving strategy application in the course of students' problem solving. Our results show:1 .In the process of learning chemistry, we find that there are many problems existing universally, such as that their consciousness of problem solving is not strong, the level of representation is low, they are lack of the strategies of problem solving and that their self-control is not sufficient. Therefore, we need urgently to understand the characters of their problem solving, to study the process of students' problem solving, and to foster and improve their ability of problem solving.2.Correct problem representation is the premise and guarantee of solving problem successfully. When high school students are solving chemical problems, they usually choose a familiar way to represent the problem, or sometimes may use several representation methods (symbol representation, mathematical representation, chart-word representation, words representation and so on) to represent the same problem. Problem representation has difference in levels and sorts. The appearance of the problem and the problem solver's knowledge structure largely affect the problem representation.3.How to select problem solving strategy and which to select greatly affect high school students' chemical problem solving's quickness and accuracy. When high school students are solving chemical problems, they mainly adopt pattern-distinguish strategy, analysis-recursion strategy, detective-search strategy, try-mistake - strategy and intuition-thought strategy etc. And among them, the most frequently used strategy is pattern-distinguish strategy. Only when students feel difficult or have no confidence in solving problem by using pattern-distinguish strategy, will they use other strategies. It shows that students' formed pattern of problem solving and the strategic knowledge of problem solving play an important role in the process of solving new chemical problems. It also shows that when they are solving chemical problems, they use several strategies synthetically. There exists a best strategy or "best combined strategy" in the course of every chemical problem solving. The more suitable the strategy or combined-strategy they choose , the shorter time they will spend solving problem while the longer on the contrary.4.In the process of students' problem solving, there exists a stage which is called "a stage fully know the problem solving "(a sober recognition of the problem and its complete solving of the continuous problem, a recognition without any obstacle in thought). The time taken to reach "a stage fully know the problem solving" in solving the same scientific problem, which to some degree can reflect the difference of the problem solvers' level.5.It's a systematic project to study students' problem solving, since the process of problem solving may be affected by many factors, and many problem still need to be further studied, such as the distribution of psychological energy in the course of strategy's carrying out, the effect of students' knowledge structure on problem solving, the distance between representation and strategy's carrying out and the influence of metacognition on problem solving etc.
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