The non-superconducting Bi_1-x(Sr_1-yCa_y)_xO_{1.5- x 2} compounds and the Bi₂Sr₂ Ca_n-1Cu_nO_2n+4 (n=1.2) superconductors have been synthesized and investigated. Using the method of band representations of space groups the complete group symmetry analysis of the normal vibrational modes has been made. Comparing the Raman spectra of the row of bismuth compounds and using the results of the group theory analysis all the strong RSS-lines have been attributed.