Electromagnetic shielding (EMS) fabrics often need to design rectangular holes for application. However, there is not a mature approach to predict the shielding efiectiveness (SE) of the EMS fabric with rectangular hole. This paper proposes that there are a number of loose regions of conductive flbers on the hole edge of the EMS fabric, and establishes a SE prediction model of the EMS fabric with rectangular hole. Firstly, the loose region of conductive flber is analyzed to build a model of the rectangular hole. Secondly, the SE prediction model of the EMS fabric with rectangular hole is deduced according to the transmission coe-cient of the normal region, hole region and loose region, and the determining method of the loose region is given. Finally, the prediction model is verifled by experiments. The results show that the model can successfully predict the SE of the EMS fabric with the plain, twill and satin weaves, and the factors such as frequency, fabric density and metal flber content have little in∞uence on the model. The proposed model can provide a valuable reference for the rational design of the rectangular hole of the EMS fabric. Electromagnetic shielding (EMS) fabric is an important EMS product and has important application in the civil, industrial and defense flelds (1). The holes are often designed in EMS fabric application, adding the leakage of the electromagnetic wave and afiecting the shielding efiectiveness (SE) of the fabric. Therefore, it is very important to correctly predict the SE of the EMS fabric with the hole, which is related to judge whether the hole design is reasonable and whether the SE of the fabric achieves the shielding requirement. There are few researches about the SE prediction of the EMS fabric with rectangular hole at present. Related researches focus on the in∞uence of the fabric density and tightness indicators on the SE (2{6). The two indicators which describe the distribution of tiny interstices in the fabric are difierent from the indicator of the hole. Therefore, the results from the two indicators are not suitable for the SE prediction of the hole indicator. Other researches focus on the SE computation methods of the metal shield box with hole, and they are mainly analytical calculation method (7), transmission line method (8), flnite-difierence time-domain (9), moment method (10), and transmission line matrix method (11). However, the metal box hole whose surface is smooth and shape is regular is difierent from the fabric hole which has a number of tiny flbers on the hole edge, and the shape is irregular. Therefore, the results from metal box are not suitable for the prediction of the EMS fabric. This paper establishes a prediction model of the EMS fabric with rectangular hole according to the EMS fabric characteristic and transmission coe-cient of the normal region, the hole region and the loose region of the conductive flber. Experimental results show that the proposed model can predict the SE of the EMS fabric with rectangular hole. The prediction model can provide a valuable reference for the design of the rectangular hole of the EMS fabric.