Abstract. Modern electronic products are changing with each passing day, and the most prominent one is the smart phone. Screen is the key part for people to extract and exchange information through mobile phones, and its development is very rapid. This article summarize the development laws of screen size, screen occupation ratio, resolution and shape from the perspective of user experience, and analyze the reasons for its development law. According to the research, the optimal size of the mobile phone screen suitable for the users is summed up and verified through the questionnaire, which provides a reliable basis for the developer of mobile phone to design smart phone screen and improve the satisfaction of the user experience.

By analyzing the problems of the subjective evaluation, put forward that the appraisal scale coefficient's concept and the determination method, then the establishment mathematical model for quantitative analysis, carries on the fair evaluation to the sample. While also given the appraisal to the different evaluators evaluation of the level, the fair degree evaluation criteria. In the judgment process, suppresses to intend the unfair phenomenon the occurrence, carries on the accurate appraisal objectively to the sample.

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Abstract.The relationship between the work efficiency and the sitting posture of the office staff was analyzed by comparing changes in operation time of different tasks at different sitting postures. Combined with the body pressure distribution experiment, the relationship of operation time at different sitting postures was concluded, which provides reference for the study on office chair design and work efficiency improvement.