To find out the impact of use of electronic products on activity of neck muscles, This study took 8 college students as the experimental subjects. They sat at the table and played with iphone and ipad under two kinds of usage: hand-held them or placing it desktop. They used electronic products to read, type and play games for 90 seconds. In this study, the surface electromyographic testing system was used to record the electromyographic signals of the left and right neck trapezius muscles. The original EMG signals were processed by filtering, full wave rectification and root mean square (RMS) amplitude smoothing, calculated integral electrical values of every 10s. The results showed that the smaller the screen size of electronic products, the higher the activation degree of trapezius, but there was no significant difference (P > 0.05).The degree of stimulation of the trapius muscle by handheld electronic products was higher than that by placing it on the table, but there was no significant difference (P > 0.05).There were significant differences in the stimulation degree of the trapius muscle between the two groups of typing and reading, typing and playing (P < 0.05), while there were no significant differences between the two groups of reading and playing (P > 0.05).The degree of activation of the left and right trapezius muscles in the flexion of the neck were different, and there were significant differences (P < 0.05).It can be seen that the screen size of electronic products, the use of different ways, different operations on the neck muscle activity have a certain impact. The activation degree of the trapezius muscles were the most significant by typing under the specific sitting position, while the changes in screen size and usage modes had no significant difference in neck muscle activity. The study also found asymmetrical activation of the trapezius muscles on the left and right sides of the neck, which in the long run can lead to asymmetrical head and neck postures, and then may increase the risk of musculoskeletal disease in the neck.