In the field of architectural interior design, color matching technology, as an important tool for shaping spatial aesthetics, will have an impact on the emotional and psychological feelings of the occupants. The article takes the color characteristics of interior design and architectural decoration style as the entry point, and constructs an interior design layout optimization model from the utilization rate of effective indoor activity space and indoor distance accessibility as the objective function. A small habitat algorithm is introduced to improve the genetic algorithm, so as to realize the solution of the interior design layout optimization model. On the basis of interior design layout optimization, the color matching of interior architectural decoration styles is carried out through IPSO algorithm and light effect rendering processing in combination with the interior layout model. The simulation results show that the improved genetic algorithm of SCT can achieve the optimal interior design layout scheme, and the color style feature score of architectural decoration reaches 4.11 points, which is only 0.02 points lower than that of the professional designer team. Making full use of the advantages of the algorithm can help users better plan the interior space, and fully improve the diversity of interior architectural decoration styles on the basis of meeting the dual needs of users’ material and spiritual needs.
