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Crystallographic parameters of TlInSSe solid solutions have been measured by X-ray diffraction. Dependences of the unit-cell parameters on the composition are determined. It is established that the values of parameters a, b, and c and the angle β decrease with an increase in x. It is shown that the TlInSSe system includes a continuous series of solid solutions based on the TlInSe compound with tetragonal symmetry at x values ≤ 0.4, while at x ≥ 0.6 solid solutions based on the TlInS compound with a monoclinic structure are formed. [ABSTRACT FROM AUTHOR]