Solid　solution　Bi2Mo1-xWxO6(x=0　similar　to　1.0)　were　synthesized　employing　hydrothermal　method　at　lower　temperatures.　XRD　results　showed　that　the　introduction　of　W　inhibited　the　crystalline　grain　growth　of　the　solid　solutions　and　led　to　smaller　crystal　sizes.　With　an　increase　In　W　content,　IR　band　around　840　cm(-1)　monotonically　shifted　to　lower　frequency,　revealing　the　formation　of　infinitely　soluble　solid　solutions.　UV-Vis　diffuse　reflectance　spectra　showed　that　the　band　gaps　of　solid　solutions　firstly　decreased.　The　band　gap　of　Bi2Mo0.6W0.4O6　was　the　smallest,　and　then　the　band　gaps　of　solid　solutions　increased.　At　the　same　time,　with　increasing　W　contents,　photocatalytic　activities　of　solid　solutions　increased　firstly,　reached　the　best　at　x=0.4,　and　then　decreased　again.　Furthermore,　photocatalytic　activities　of　the　samples　containing　W　were　better　than　that　of　Bi2MoO6.　This　might　be　resulted　from　the　band　gap,　band　structure　and　the　variation　of　the　crystal　size　of　solid　solutions.