Methods Infective disease transfer model were explored and the main principle and method of field epidemiological investigation were analyzed.
方法阐述传染病的感染和传播的基本模式，分析现场流行病学调查的基本原理和策略。
Methods: Based on method of epidemiological investigation, 475 patients' data of DILD collected.
方法：采用流行病学方法，收集弥漫性肺间质疾病临床调查资料475份。
Method Combine the investigation of Epidemiological with the hydrography data.
方法采用流行病学调查结果与水文地质资料相结合的方法。
应用推荐