Scalp-recorded event-related potentials (ERPs) appear to be sensitive to sentence processing, especially in some particular aspects. ERP studies on inflectional Indo-European languages report that N400 (negativity around 400 ms), typically elicited by semantic anomalies, is absent when a sentence involves both syntactic and semantic violations. It has been considered that syntactic structure building takes precedence over semantic parsing, and lexical-semantic processing can be blocked by syntactic category incongruence. An ERP experiment was conducted to examine whether such syntactic primacy also exists equally in sentence comprehension in Mandarin Chinese, using the long passive sentences of bei constructions (bei is a preposition preceding a predicate verb and expressing a passive meaning) with either semantic or syntactic violations, combined violations of both, or no violations. Results showed that a broad negativity appeared in both purely semantic and combined violations in the time window of 300-500 ms, which implies that lexical-semantic parsing is not blocked by syntactic structure failure. Instead, it is of great significance to the comprehension of long passive sentences in Mandarin Chinese (see Video, Supplemental Digital Content1, http://links.lww.com/WNR/A592, which introduces the article).