Background　With　computerized　analysis　of　fetal　heart　rate(FHR)　data　from　long-range　monitoring,　we　aimed　to　comprehensively　clarify　the　characteristics　of　FHR　with　increasing　gestational　age　in　low-risk　pregnant　women　during　the　third　trimester　of　pregnancy.　Methods　This　was　an　observational　study.　85　fetuses　of　low-risk　pregnant　women　were　included.　The　data　covered　28　similar　to　40　weeks　of　gestation,　and　125　cases　of　FHR　monitoring　from　85　fetuses　were　totally　collected.　The　FHR　baseline　rate,　variability,　and　acceleration　were　computationally　calculated,　analyzed　and　compared.　Results　The　average　effective　monitoring　time　for　each　case　was　13.9　+/-　4.3　h.　FHR　baseline　gradually　decreased　as　the　gestational　age　progressed,　and　the　maximum　FHR　baseline　appeared　at　28-29　weeks,　which　was　137.5　(133.0,　141.3)　bpm,　whereas　the　minimum　FHR　baseline　appeared　at　38-39　weeks,　that　was　132.8　(128.1,　138.4)　bpm.　FHR　variability　fluctuated　in　(4-12?bpm.　It　gradually　increased　from　28　to　33　weeks　of　gestation,　reached　the　maximum　of　7.6　(6.0-9.4)　bpm,　and　then　decreased　until　full-term　pregnancy.　The　moderate　variability　proportion　of　FHR　gradually　increased　from　28　weeks　of　gestation,　peaked　at　32-33　weeks　as　65.8%,　and　then　gradually　decreased　to　56.2%　at　37　weeks,　which　was　maintained　at　this　level　until　39　weeks.　The　variation　tendency　of　minimal　variability　proportion　was　opposite　to　moderate　variability　proportion.　When　it　reached　40　weeks,　the　minimal　and　moderate　variability　proportions　were　50.0%　and　49.0%,　respectively.　The　FHR　acceleration　area　showed　no　trend　change　during　the　third　trimester,　while　fluctuated　in　(29.5-42.4)　lattices/h.　Conclusion　This　study　revealed　that　the　characteristics　of　FHR　gradually　changed　with　increasing　gestational　age,　and　the　most　obvious　change　was　observed　at　32-33　weeks,　demonstrating　that　the　specific　gestational　weeks　may　be　an　important　period　for　the　physiological　bias　of　FHR　tends　to　mature.