Abstract: Application of fuzzy logic structures in Computer Aided Design (CAD) of digital electronics substantially improves quality of design solutions by providing designers with flexibility in formulating goals and selecting tradeoffs. In addition, the following aspects of a design process are positively impacted by application of fuzzy logic: Utilization of domain knowledge, interpretation of uncertainties in design data and adaptation of design algorithms. We successfully applied fuzzy logic structures in VLSI cells placement algorithm for physic stage of the design process. We are modified the matrix connection by using fuzzy relation. Attempts to apply the fuzzy set theory to problems of physical design, the connectivity matrix was modified and then the fuzzy set theory was used to construct clusters for placement.