Abstract: The paper aims to explore the occurrence of haze disaster in west plain of Shandong, the authors analyzed the changes and characteristics of haze disasters in Liaocheng in nearly 53 years, explored the occurrence of haze disaster in west plain of Shandong. The results showed that: haze disasters had wave trend, increased from 1961 to 1981, decreased from 1982 to 2010, rapidly grew in the past 3 years, the maximum number of hazard days were 157 in 2013; the seasonal variation was the most in autumn and winter, while the least in summer; monthly variation characteristics had a‘V’-shaped trend, the number of variation was the most in December, followed by that in January, and the least in August. Haze disaster occurred most frequently in Guanxian, followed by that in Yanggu, and occurred least in Shenxian. Strengthening cooperation of government departments, reducing contamination, enhancing defense mechanism, optimizing urban plan, increasing urban green space, and developing ecological agriculture were approaches to defense haze.