Product reviews are subjective comments submitted by customers. Nowadays,product reviews are in the form of Micro-blog text which is typically very short but with varied structures. We proposed a novel sentiment classification method for product reviews from Micro-blog based on cascaded Conditional Random Field( CRF). First,reviewsentences were divided into a number of clauses based on the theory of clausal pivot. Then,features of the Chinese clause sequences were exploited to train a coarse-grained CRF sen...