Abstract: A serological method for the diagnosis of paragonimiasis was introduced; The carbon antigen was prepared with carbon particles sensitized by sonicated Porogonimus antigen (100mg carbon: 10-12mg antigen). Sera of 64 patients of paragonimiasis were tested and all of them showed positive reactions (≥1:32), while 374 sera of normal human and other patients gave 2.4% false positive only. Four other serological test were run simultaneously with this method, the positive rate of ELISA and ICAT were 100% (64 cases), IHA 96.9%, CIE 84.1% and AGD was 73.4%. Thus the ICAT is a specific, sensitive, simple and rapid diagnostic tool for paragonimiasis.