## 3 Theoretical System Construction
### Application of Grounded Theory in Data Classification and Structure Construction
#### 3.2.4 Theoretical Saturation Test  
After completing the three-level coding of the grounded theory, the research team introduced 50 reserved phoenix pattern image samples to verify further the integrity and adaptability of the constructed theoretical structure through theoretical saturation tests. This study mainly carried out tests from the two dimensions of \"category reproducibility\" and \"category extensibility\". First, in terms of category reproducibility, the research team employed the two-person cross-coding method to code the newly added samples individually. The results showed that all information can be effectively classified into the existing seven-dimensional frame \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Main Category** & **Subcategory** & **Frequency** & **Percentage** \\ \hline \multirow{6}{*}{AS\_Application scope} & AS01\_Decoration of objects & 36 & \\  & AS02\_Clothing and fabrics & 43 & \\  & AS03\_Architecture and furnishings & 17 & \\  & AS04\_Religious and ritual uses & 6 & \\  & AS05\_Cultural creation and graphic design & 24 & \\  & AS06\_Daily and practical objects & 24 & \\ \hline \multirow{6}{*}{CP\_Composition pattern} & CP01\_Compositional graphic structure diagram & 39 & \\  & CP02\_Dynamic posture diagram & 21 & \\  & CP03\_Pattern composition relationship diagram & 14 & \\  & CP04\_Geometric outline diagram & 17 & \\  & CP05\_Spatial hierarchy and background diagram & 19 & \\  & CP06\_Compositional aesthetic characteristics diagram & 8 & \\ \hline \multirow{6}{*}{CYs\_Colour system} & CYs01\_Main colour category & 42 & \\  & CYs02\_Colour-matching relationship and contrast & 25 & \\  & CYs03\_Colour texture and material feel & 8 & \\  & CYs04\_Colour and pattern structure fusion & 19 & \\ \hline \multirow{6}{*}{EL\_Element Ormmentation} & EL01\_Main biological image pixel & 49 & \\  & EL02\_Structural component pixel & 82 & \\  & EL03\_Posture dynamic expression pixel & 22 & \\  & EL04\_Flower and plant pixel & 42 & \\  & EL05\_Geometry and border pixel & 33 & \\  & EL06\_Decoration pixel & 18 & \\  & EL07\_Pattern structure combination pixel & 42 & \\  & EL08\_Pixel abstract/variant element & 4 & \\ \hline \multirow{6}{*}{MT\_Media and technology} & MT01\_Medium properties & 42 & \\  & MT02\_Techniques and techniques & 52 & 12.05\% \\  & MT03\_Compound technology & 27 & \\ \hline \multirow{6}{*}{SM\_Symbolism and meaning} & SM01\_Dynamic posture expression & 18 & \\  & SM02\_Body image characteristics & 35 & \\  & SM03\_Cultural symbolism & 23 & \\  & SM04\_Aesthetic style and taste & 38 & 17.43\% \\  & SM05\_Colour and gloss atmosphere & 16 & \\  & SM06\_Decorative composition and structure & 36 & \\  & SM07\_Style and imprint of the times & 9 & \\ \hline \multirow{6}{*}{TC\_Theme context} & TC01\_Mythological characters & 7 & \\  & TC02\_Bird images & 24 & \\ \cline{1-1}  & TC03\_Children and children playing & 6 & 5.38\% \\ \cline{1-1}  & TC04\_Auspicious symbols & 13 & \\ \cline{1-1}  & TC05\_Other themes & 4 & \\ \hline Total & 1004 & 100.00\% \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Secondary coding statistics. work system, and the coding logic is consistent with the original classification system. No new systematic categories have emerged, indicating that the existing structure exhibits good conceptual reproducibility. To ensure coding consistency, the research team conducted three rounds of pre-coding training before formal coding. They compared and corrected divergent coding results through negotiation, ultimately achieving a coding consistency rate of more than 85% (intercoder agreement), which improved the reliability of the theoretical construction. Secondly, in terms of category extensibility, although some samples exhibit marginal differences in form, colour, or craft details, their expression characteristics can still be included in the existing subcategory structure without significantly breaking through the dimensional boundary, which further confirms that the constructed model has strong adaptability and cultural sample tolerance.