The present invention provides a 4'-substituted benzyloxy -3',5'-dimethoxyphenyl-butadiene type derivatives and the medical salt or solvent thereof with the above general formula , wherein 4'-subsituted benzyloxy -3',5'-dimethoxyphenyl-benaldehyde and bromoethylcrotonate-triphenylphosphonium are mixed, and the mixture is reduced by a complex of lithium aluminium hydride and aluminium chloride to obtain the corresponding chemical compound. The chemical compound provided by the present invention has important biological activity, cytotoxicity experiments in vitro on human lung cancer cells (A549), human chronic myeloid leukemia cell Line (K562), human karyotype leukemia cell(HL-60), and mice lymph-type tumor (P388D1) tumor cells indicate that the derivatives of 4'-substrate benzyloxy -3',5'-dimethoxyphenyl-butadiene has the suppressive function on both the growth of tumor cells and multiple tumors in vitro, and can be applied to preparation of drugs for tumor prevention and treatment.