RESUMEN
In order to identify 35 key work items indicating the workload, difficulty of nursing technology and nursing risk of different wards scientifically, a mathematical model of classification of wards was established by literature review, conference discussions, expert consultation, brainstorming, and field measurement, and information technology as well. On such basis, scores of the wards were calculated, and the total scoring of each ward was ranked from high to low into three categories and six grades. Each grade of wards was assigned with different performance distribution weights. Such a mathematical model for ward categorizing and grading based on HIS system and key item and weights, can monitor ward nursing in real time, and provide nursing administrators at all levels with clinical risk early warning by means of vertical and horizontal comparisons. These administrators can take precautions in time in terms of human resources and materials. Ward categorizing and grading as an indicator for performance distribution ensures the rationality of such distribution, enhances nursing motivation and stabilizes front-line nursing teams in the end.