To understand the current situation of health shock and its intensity among low?income population， Logistic model and Tobit model were used to analyze the influencing factors of health shock of low?income population based on the data of the 6th National Health Service Survey in Jiangsu Province. The results showed that the incidence of health shock of low?income population was 19.39% （392/2 022）， with an average intensity of 0.096. The results of Logistic regression analysis showed that having a job， high annual per capita income level， participating in serious illness insurance and good self?rated health status were the positive factors of health shock（P<0.05）， while coming from urban areas， suffering from a variety of chronic diseases， anxiety or depression were the negative factors（P<0.05）. It is necessary to increase the support of government funds and policies， construct the chronic disease prevention and control system， perfect the medical security system， and pay special attention to the mental health education of the population.