Great Xing’an range is a key area to theevolution of Central Asia Orogenic Belt(CAOB), where some debates, such as the closure time of PaleoAsian Ocean and the suturing time and space relationship between ErgunaXing’an and Songnen block, still remain controversial till today. This study carrys out the U-Pb dating and geochemical analysis on the basis of researches on late Paleozoic sea face volcanic. The result shows that the andesite age of Daminshan Formation at Zhalantun area is 362.2±3.3Ma. Combining with the paleontology data, it is suggested that the explosion time of Daminshan Formation volcanic rock is in late Devonian epoch Famennian. The geochemical characteristics of the basic volcanic rock of Daminshan Formation are high content of Al2O3、TiO2 and Mg#, and the features of REE and trace elements are similar with Ocean Island Basalt(OIB). Those of the felsic rocks are high content of Al2O3, but low content of TiO2and Mg#, and the REE and trace elements patterns reveal a volcanic arc characteristic. Compositing geochronology and geochemistry information we conclude that ocean island basalt had developed at Zhalantun area, and middle to felsic volcanic arc rocks are present, which suggest that the PaleoAsian Ocean was at closing period at Zhalantun area during late Devonian epoch. The intercontinental sea basin existed at early period, and after that the active continental margin formed due to the collision of ocean and continent slabs in the late stage. The results here provide new geological information to the evolution of northward extension of HegenshanZhalantunNenjiang suture and PaleoAsian Ocean tectonic domain.