The diagnosis of preschool gifted children in Turkey has just come up in recent years. Therefore, there is a need for measurement tools that can be applied during the diagnosis phase of preschool gifted children. The aim of this study was to diagnose the relation between the non-verbal and culture-independent Colour Progressive Matrices Test that's frequently used in the international field during the preschool period and the Cognitive Ability Test Form-6, which is a group of tests that assess the cognitive abilities of children in different age groups including verbal, quantitative and nonverbal dimensions, and which is also used in the diagnosis of gifted children in the international arena, to contribute to the diagnosis of preschool gifted children. The sample of the study consisted of 125 children who attended nine preschool education institutions determined by the socio-economic level (low-middle-high) in the central district Efeler of the province Aydin. The mean age of the children is 4.9 and the standard deviation is 0.8. 49 of the children were girls (39.2%) and 76 were boys (60.8%). Colour Progressive Matrices Test and Cognitive Abilities Test Form-6 were implemented individually to the children. The study revealed that the tests had correlation, the verbal and quantitative dimensions of the Cognitive Abilities Test Form-6 were found to predict the nonverbal cognitive ability of the Coloured Progressive Matrices Test.