Abstract: Up to now 139 species of Helina have been recorded in China.This paper describes five new species of the genus Helina R.-D.,1830 from mountainous region of the western part of Sichuan Province during years 1980-1989,I.e.Helina subevecta sp.nov.,Helina solata sp.nov.,Helina zhougongshanna sp.nov.,Helina kangdingensis sp.nov.and Helina appendicivena sp.nov.The type specimens are deposited in the Medical Entomological Collection,Institute of Microbiology and Epidemiology,AMMS,Beijing,China. 1 Helina subevecta sp.nov.(Figs.1-3) ♂:Body length 9.0 mm.This new species is closely related to Helina evecta (Harris,1780),but differs from the latter in the longest hairs on arista about 1.8 times the width of 3rd antennal segment;mid tibia with 6 p,hind tibia with 4-5 av,8-9 ad and 13 p. ♀:Unknown. Holotype♂,Mt.Zhougong (1 760 m;29°58′N,102°54′E),Yaan,Sichuan Province,31-Ⅲ-1982,coll.FENG Yan. 2 Helina solata sp.nov.(Figs.4-6) ♂:Body length 7.0 mm.This new species is closely related to Helina minutideleta Xue,Li et Wang,1996,but differs from the latter in parafacialia about 1.5 times the width of antenna;arista short plumose,the longest hairs on arista about 1/2 times the width of 3rd antennal segment;costal spine short;near r-m cross-vein clouded;halteres yellow;hind tibia with 6 av;3rd and 4th tergites each with a pair of large square black-brown spots;outer protuberance of distal part of cerci small. ♀:Unknown. Holotype♂,Mt.Jiaoding (3 550 m;29°23′N,102°51′E),Hanyuan,Sichuan Province,21-Ⅵ-1989,coll.FENG Yan. 3 Helina zhougongshanna sp.nov.(Figs.7-9) ♂:Body length 7.0 mm.This new species is similar to Helina densihirsuta Fang et Fan,1993,but differs from the latter in hind tibia densely with 1-2 complete rows of av,and with 3 ad,distal 3/4 with 2 rows of long fringe hairs;abdomen with gray pollen,3rd and 4th tergites with a pair of fuscous-black spots respectively,and posterior margin of 5th tergite with a pair of small triangular spots;outer protuberance of distal part of cerci large. ♀:Unknown. Holotype♂,Mt.Zhougong (1 760 m;29°58′N,102°54′E),Yaan,Sichuan Province,2-Ⅸ-1989,coll.FENG Yan. 4 Helina kangdingensis sp.nov.(Figs.10-12) ♂:Body length 6.0 mm.This new species is closely related to Helina rastrella Hsue,1985,but differs from the latter in basal 1/3 of mid femur with 4-5 blunt pv,distal 3/4 of hind femur with a row of av;abdomen is long conic,3rd and 4th tergites each with a pair of round blackbrown spots;cerci on apical part narrower in profile. ♀:Unknown. Holotype♂,Kangding (Wenquan-Erdaoqiao,2 600 m;30°07′N,102°10′E),Sichuan Province,20-Ⅶ-1982,coll.FENG Yan;paratype 1♂,Mt.Erlang (Muyepeng,2 900 m;29°53′N,102°10′E),Sichuan Province,19-Ⅸ-1980,coll.FENG Yan. 5 Helina appendicivena sp.nov.(Figs.13-15) ♂:Body length 6.5 mm.This new species is closely related to Helina blaesonerva Ma et Wang,1992,but differs from the latter in near r-m and m-m cross veins clouded,m-m cross vein with a short redundant vein on middle part;stpl 1∶2;hind tibia with medial 2-3 pv and a row of 7-8 p;outer protuberance of distal part of cerci small in posterior view. ♀:Unknown. Holotype♂,Mt.Erlang (Tree Farm,2 740 m;29°54′N,102°08′E),Sichuan Province,26-Ⅴ-1984,coll.FENG Yan;paratype 1♂,same as holotype.