Two experiments examined the effect of connectives on sentence and text reading. Delayed integration hypothesis and incremental interpretation have been postulated to examine the role of connectives. According to the delayed integration hypothesis, readers process two clauses linked by a connective by interpreting each clause separately and combining them when they reach the end of the second clause. However, incremental interpretation proposes that semantic processing takes place incrementally. In the first experiment, readers' eye movements were monitored as they read sentences containing adversative the connectives ”but” with different clausal semantic relatedness. Results indicated that readers spent more processing time on clauses with less semantic relatedness. Connectives helped reader integrating clausal semantic information. There was no interaction between clausal semantic relatedness and connectives. Moreover, duration of readers' first gaze on the end of second clause was not longer than any other content words. It seemed to indicate readers didn't integrate clauses at the end of the second clause, and that readers integrated words incrementally. In the second experiment, both adversative and causal connectives were inserted in texts. The incremental interpretation was also observed. These experiments support that connectives facilitate reading and readers integrate semantic units incrementally.