Abstract: Named entity recognition is particularly critical in natural language processing. There are overlong entities in the requirements document: virtual function, which makes it hard for pervasive traditional named entity recognition method to recognize entire entity. This paper conducts an in-depth research on the entity recognition model of requirements documents, introduces CNER method, which is based on Deep Residual Network (ResNet), to combine with the method based on grammatical regulations to perform word segmentation of Chinese requirements documents. This paper’s NER model is an encoder-decoder model, applies Bidirectional Long Short-Term Memory network (BiLSTM with attention) to encode, which obtains the context features and sentence pattern features of the text after word segmentation, employs conditional random field (CRF) method to decode, then identifies the requirements document entities with the intervention of grammatical regulations as a combination. Experiments show that the proposed method has better recognition effect than the pervasive traditional methods.

Key words: named entity recognition, CNER, ResNet, BiLSTM, CRF, grammatical regulations