Abstract: Characteristics of problem-finding thinking were investigated in living and scientific fields. 620 undergraduates attended the experiment. The problems were tested from the whole quantity, the products of thinking, the levels of thinking, the opening of thinking and the quality of thinking. The results showed, 1) The whole level of problem-finding thinking in the students of different grades and genders were almost equally, while the scores of the levels of thinking and delicacy in male students were higher than in female students. Attitude affected the quality of problems. 2) There were differences between scores of problem-finding thinking in different fields. 3) The students could be classified in two types,based on their problem-finding ability. 4) Most problems were concerned with medium or lower level of thinking.