| Since 2000, the worms in Chengjiang fauna have been investigated more thoroughly, systematically and dedicatedly. The amounts of the genera and species have increased greatly; A great of progresses on preservation, taphonomic and ecology etc have been achieved. Based on the studies of former, the author makes these achievements as follows:1. Jianshan section of Haikou was measured and described and some monospecific layers were reported in Chapter I.2. Several phyla of introverts are briefly introduced in Chapter II.3. Further examinations have been made on preservation, taphonomic and ecology of the Chengjiang worms in Chapter III.4. 13 genera and 13 species including nematomorphs: Cricocosmia jinningensis, Maotianshania cylindrica, Palaeoscolex sinensis, Mafangella haikouensis gen. et sp. nov.,Tabelliscolex hexagonus Han, Zhang, Shu, gen. et sp. nov., Tylotites petiolaris Luo et Hu; priapulids: Paraselkirkia sinica, Xiaoheiqingella peculiaris; loricifera: Sicyophorus rara; phyla uncertain: Acosmia maotiania, Corynetis brevis, Laojieella thecatus gen. et sp. nov., Jianshanella lubricus gen. et sp. nov., are described in Chapter IV. Of which 4 new genera and 4 new species are established. Discovery of a lot of fossil worms with their traces provide direct clues to study on the locomotion style of the worm and indirect evidences for trace fossils to find their producer. Cricocosmia jinningensis was attached by the brachiopod Inquilinus haikouensis gen. et sp. nov., this most intimate relationship between different genera has not been reported before in Chengjiang fauna.5. Based on the material of Chengjiang fauna, the evolution of introverts were discussed in Chapter V. The early introverts have been divergent in the Early Cambrian. The common ancestor of introverts may has a retractable proboscis.
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