The detection of many synthetic chemicals used in industry that may pose a genetic hazard in our environment is of great concern at present. Since these substances are not limited to the original products, and enter the environment, they have become widespread environmental pollutants, thus leading to a variety of chemicals that possibly threaten the public health. In this respect, to regulate and to evaluate the chemical hazard will be important to environment and human health. The clastogenicity of 17 synthetic chemicals was evaluated in Chinese hamster lung fibroblast cells in vitro. Two most cytotoxic chemicals, dodecyl methacrylate (CAS No. 142-90-5) and 2-ethylhexyl methacrylate (CAS No. 688-84-6), among 17 chemicals tested revealed no clastogenicity in the range of 0.0165-0.066 $mu extrm{g}$/$mell$ and 0.006-0.024 $mu extrm{g}$/$mell$ both in the presence and absence of metabolic activation system, respectively. All 17 chemicals revealed no significant induction of chromosomal aberration both in the presence and absence of metabolic activation system in this assay. From the results of chromosomal aberration assay with 17 synthetic chemicals in Chinese hamster lung cells in vitro, we did not observed positive clastogenic results in this study.