Abstract: What kind of a paper is a good paper? Strong logic might be a common feature of a good paper. This paper addresses the logical expression of a study or a paper from three points of view:context of a research question, transition between different sub-studies in a series of study and development of evidence accumulation. For clear presentation of research question context researchers need, first of all, to make a strong argument on why the problem is so important, and then to give the clear-cut theoretical and operational definitions of core concepts, to quote and cite extensively references from different sources, and to illustrate theoretical and practical values of a research question. Researchers also need to make clear and persuasive evaluations on previous studies with special comments on research limitations or gap between what has already been known and what should be know. For rational design of sub-studies in a big project, researchers can use parallel transition or deep-going transition with 9 methods to progressively develop the related research. For development of evidence accumulation, researchers need to ask themselves questions such as:where is the evidence? is it weak or strong evidence? Does my claim enjoy support from evidence chain? They also need to know in which evidence stairs of casual relationship their research is aiming for. In the last part of this paper, it is pointed out that a good study or a good paper should make readers enjoy persuasive intelligence, thinking strength, and rationality brightness.