Two new spider families from Late Cretaceous Kachin amber (Myanmar),?Pilosarachnidae Jiang & Li,fam.nov.and +Gigarachnidae Jiang & Li,fam.nov.,are described:Pilosarachneju Jiang & Li,gen.& sp.nov.and Gigarachne bian Jiang & Li,gen.& sp.nov.Type specimens are deposited in the Institute of Zoology,Chinese Academy of Sciences in Beijing (IZCAS).Both families bear three tarsal claws and are most likely entelegyne.Diagnostic characters of extinct families in Kachin amber with uncertain relationships with extant fauna are listed and discussed.