工业经济的高速发展使我国职业病发病率以每年15%的速度攀升,然而,现代医学科学尚难以判断一些疾病与所从事职业的必然联系。正因为如此,为了维护弱势群体的合法权益,我国法律规定了因高危作业、环境污染、有害生产等致害而导致的民事赔偿案件适用举证责任倒置。这样,职业病索赔应该是简单了,但事实远非如此,职业病索赔诉讼屡屡遭遇艰难,原因在哪里? With the rapid development of industrial economy, the incidence of occupational diseases in our country climbs at a rate of 15% per year. However, modern medical science can not judge the inevitable connection between some diseases and occupations. Precisely because of this, in order to safeguard the legitimate rights and interests of vulnerable groups, our law provides for the reversal of the burden of proof for civil compensation cases resulting from high-risk operations, environmental pollution and harmful production. In this way, claims for occupational diseases should be simple, but the fact is far from it. The claims for occupational diseases have encountered repeated difficulties. Why?