One specimen collected in Hengdaohezi county (44°48′44″ N, 129°02′04″ E, alt. 740 m), Heilongjiang Province, China, is identified as the slender shrew (Sorex gracillimus) according to the morphological and molecular analysis. The species is considered to be formal record to the mammalian fauna of this province. Skull is almost nearly circular (Fig. 1a). Kiss is very narrow (Fig. 1). The behind tip is larger than the previous from maxillary incisors (Fig. 2a). The unicuspid of maxillary is each getting smaller (Fig. 2a). Mandibular incisor extends forward very long (Fig. 2b). Mandibular incisor on the cutting edge has four tines and three deep notch. Canines is small, and is 1/2 high of premolars (Fig. 2b). Skull indices of the sample were measured (Table 1). Condylobasal length of skull was 13.29 mm. Height of cranial was 4.25 mm. Orbital spacing was 7.84 mm. Cranial breadth was 7.84 mm. Length of the upper tooth was 6.23 mm. Similarity in 1 140 bp Cyt b complete sequence of specimens and known sample of S. gracillimus is 96%. Similarity with S. caecutiens and S. minutus respectively are 91% and 89%.