Abstract: In order to understand spatial pattern and interspecific association of dominant populations in secondary savanna shrub forest in dry-hot valley, a 1 hm² permanent sample plot was established in Panzhihua Cycas panzhihuaensis National Nature Reserve. The individual plants of all populations in the sample plot were investigated per tree, the dominant population composition of the community was analyzed by the important values, and the spatial pattern, interspecific association, and relationships of aggregation scale and dominance of dominant populations in community were executed by using function O-ring and software SPSS. The results showed that the dominant species in the secondary savanna shrub forest in dry-hot valleys were trees or small trees except Cycas panzhihuaensis. The spatial distribution pattern of the six dominant populations was all random distribution, which was followed by aggregation distribution, and the proportion of uniform distribution scale was the smallest. The dominance of population increased with the increase of aggregation scale, and there was a positive linear correlation between them. The regression equation was y = (127.49 ± 9.04)x + (4.78 ± 1.88) (Adj-R² = 0.98, P = 1.46993E-4 < 0.01). The proportion of interspecific correlation scale was the largest in non-correlation, followed by negative correlation and the smallest in positive correlation. The dominance of populations in community was determined by aggregation scale, which was also the main driving force to change dominant position of populations in community. The main survival pressure of Terminalia franchetii was from C. panzhihuaensis and Morus mongolica, which was also easily affected by community environment. The main reason for regulating twice of intraspecific density was interspecific competition from Quercus cocciferoides and M. mongolica, as well as T. franchetii and M. mongolica.