The invention discloses an aryl hydrocarbon receptor modulators of formula (I), and pharmaceutically acceptable salts thereof,R' is H, CN, CH<；sub>；2<；/sub>；(OH)R<；sub>；0<；/sub>；, C<；sub>；m<；/sub>；H<；sub>；2m+1<；/sub>；, C<；sub>；n<；/sub>；H<；sub>；2n-1<；/sub>；, C<；sub>；n<；/sub>；H<；sub>；2n-3<；/sub>；,two R<；sub>；a<；/sub>；is independently H, or two R<；sub>；a<；/sub>；together form =O or =N-W<；sub>；3<；/sub>；-R<；sub>；1<；/sub>；； A is a C<；sub>；6<；/sub>；to C<；sub>；10<；/sub>；aromatic ring, or a C<；sub>；2<；/sub>；to C<；sub>；10<；/sub>；heteroaromatic ring containing 1 to 5 heteroatom selected from N, O and S, or 4 to 7 membered non-aromatic heterocyclic ring containing 1 to 3 heteroatom selected from N, O and S and C=N, which are with no substituent or substituted by 1 or 3 R； Q is R, or a C<；sub>；6<；/sub>；to C<；sub>；10<；/sub>；aromatic ring or a C<；sub>；2<；/sub>；to C<；sub>；10<；/sub>；heteroaromatic ring containing 1 to 5 heteroatom selected from N, O and S, which are with no substituent or substituted by 1 or 3 R； R is R<；sub>；c<；/sub>；connected with C or R<；sub>；N<；/sub>；connected with N. Compounds of this invention of formula (I) can modulate activity of AhR for inhibiting growth of cancer cell and inhibiting migration and invasion of tumour cell.
