[Purpose/significance] The timeliness and impact of journals are two very important characteristics of jour? nals. Both are important components of journal evaluation and are closely related to the quality of journals. It is crucial for researching journal’s development that the relationship between timeliness and impact and the relationship be? tween combinatorial characteristics of the journal. [Method/process] This paper uses 46 journals in library science and information science in the Annual Report for Chinese Academic Journal Impact Factors as data sources, proposes the journal timeliness index, studies the relationship between journal timeliness and impact, and creates a four-quad? rant model by creating a four-quadrant model.Research the classification characteristics of journals with different time? liness and impact. [Result/conclusion] The research found that: the journal timeliness index is helpful to identify jour? nals with different content in the same discipline; The average elasticity of journal timeliness to impact is positive, but the elasticity of timeliness will gradually decrease with the increase of impact; Through the four-quadrant model, it is found that the quality of high timeliness and low impact journals and low timeliness and low impact journals need to be improved;The fund-sponsored paper ratio and the average number of references of high timeliness and low impact jour? nals are at a low level compared with low timeliness and high impact journals;The number of citing journals of low time? liness and low impact journals is at a low level compared with high timeliness and high impact journals.