Objective:To explore the effect of surface laser positioning visual intervention model on the quality of the chest compression alone. Methods: Surface laser positioning visual intervention model was build. 84 medical staff in the emergency department , ICU and PICU whom had passed CPR training were randomly assigned into intervention group (n=42) and control group (n=42). Both groups carry out chest compressions alone on adult intelligence simulated human for 4 min. The intervention group had to let the skin mark pass the light beam which sent from the laser positioning system. The overlapped palms thickness was measured. The data of pressing frequency, right depth rate (≥ 5 cm) per minute, the heart rate, systolic blood pressure and diastolic blood pressure in pre- and post-CPR were constantly recorded. Results: The overlapped palms thickness of all staff was 65.08 ±6.47 mm. Pressing frequency in both groups can reach recommendation of international guideline , while the pressing frequency , right depth rate per minute of control group had began to decrease significantly by the second minute (P < 0.05). In the intervention group, the frequency was no significant difference among every minute (P > 0.05), and the right depth rate per minute had began to decrease significantly by the third minute(P < 0.05). Compared with the control group, the right depth rate of the intervention group had significant difference in the third and fourth minute (P < 0.05).In both groups, the heart rate, systolic blood pressure decreased significantly pre- and post-CPR(P < 0.05), while there was no significant difference between groups (P > 0.05). Conclusion: Surface laser positioning visual intervention model can improve the quality of the chest compression alone,and can not increase rescuer fatigue.%目的：观察体表激光定位可视化干预对单纯胸外按压质量的影响。方法：建立体表激光定位可视化干预模型，将我院急诊、ICU、PICU经系统CPR培训的84名医护人员，随机分为对照组和干预组各42人。两组均对模拟人进行持续的单纯胸外按压4 min，干预组同时要求在体表激光定位装置指示按压深度情况下按压。测量两组入选者双掌叠扣厚度，记录各分钟内按压次数、深度正确的按压次数以及按压前后心率、血压数值。结果：全体入选者双掌叠扣厚度为65．08±6．47 mm，两组各分钟按压频率均达到指南推荐要求，对照组各分钟按压频率及深度正确按压次数在第2 min开始显著下降（P ＜0．05）。干预组各分钟按压频率无统计学差异（P ＞0．05），而深度正确的按压次数在第3 min开始显著下降。干预组第3、4 min深度正确的按压次数比较对照组差异有统计学意义（P ＜0．05）；两组按压后心率、收缩压均较按压前显著增高（P ＜0．05），但组间比较无统计学差异（P ＞0．05）。结论：体表激光定位干预能有效改善持续单纯胸外按压质量，且不会加剧操作者疲劳。
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