In recent years, complex differential equations and complex difference equations have played an important role in complex analysis. The Nevanlinna theory involving q@-difference has been developed to study q-difference equations and q-difference polynomials. Many papers have focused on complex difference, giving many difference analogues in value distribution theory of meromorphic functions. In the paper under review, the authors investigate the meromorphic solutions of q-difference differential equations. The results of the paper give estimates for the counting function and proximity function of meromorphic solutions to these equations. In addition, some interesting results are proved for two general equations and a class of system of q@-difference differential equations. The results of the paper extend some previous results. Examples are also provided by the authors in support of their results.