Objective To analyze the impact of health service and some other factors on the improvement of health. Methods The production function model introduced by Auster was employed. With the age adjusted mortality taken to be the output of health and factors like health service, life style, living environment, economy, and education taken to be the input, the two-stage least square was used to analyze the impact as well as the degree of the impact of the various factors. Results The impact of health service, the contribution of which to the age adjusted mortality was around 0.37, was greater than that of education but smaller than that of economy. Conclusion The result indicates that health service is an important influencing factor in the improvement of health. Full attention ought to be paid to it so that investment into health, especially public health, will be expanded and the health of the people better protected.