演示实验可以培养学生的实验兴趣,获得感性认识,提高学生的观察和分析能力。一个成功的演示实验对教师来说无形中会增加其在学生中的影响力,获得更好的教学效果。对实验员而言就要认真准备,为教师做好服务,即提供设备及技术上的支持,确保实验的成功。因此,探索更好的实验效果是实验员的重要职责,也是专业素养提升的有效途径。实验员在准备实验的过程中常会遇到一些困 Demonstration experiment can cultivate students ’experimental interest, obtain perceptual knowledge and improve students’ observation and analysis ability. A successful demonstration experiment for teachers virtually increases their influence among students and achieves better teaching results. In the case of lab technicians, they should be carefully prepared to serve teachers well, that is, to provide equipment and technical support to ensure the success of the experiment. Therefore, to explore a better experimental results is an important responsibility of the experimenter, but also an effective way to enhance professionalism. The experimenter often encounters some difficulties in preparing the experiment