This book constitutes the refereed proceedings of the 12th China National Conference on Computational Linguistics, CCL 2013, and of the First International Symposium on Natural Language Processing Based on Naturally Annotated Big Data, NLP-NABD 2013, held in Suzhou, China, in October 2013. The 32 papers presented were carefully reviewed and selected from 252 submissions. The papers are organized in topical sections on word segmentation
open-domain question answering
discourse, coreference and pragmatics
statistical and machine learning methods in NLP
semantics
text mining, open-domain information extraction and machine reading of the Web
sentiment analysis, opinion mining and text classification
lexical semantics and ontologies
language resources and annotation
machine translation
speech recognition and synthesis
tagging and chunking
and large-scale knowledge acquisition and reasoning.