To monitor the change of atmospheric particles' heavy metal concentration timely, two suits of ICP-MS system with direct injection module are built and tested. A long-time concentration change of atmospheric particles' heavy metals is monitored, and the performance indicators of these two suits are tested. The difference between the two suits and XRF method is compared. The results show that the two suits have high consistency in heavy metal concentration and the changing trend. The detection limit of both suits reaches μg/m3 level, the precision of both suits is <5%, and the 24-hour drift of both suits is <2% (except K and Ca). The heavy metal concentration changing trend obtained by ICP-MS system is consistent with that by XRF method.