TIKSentence TreeMaker is an application built by the Indonesian a]Association of Computational Linguistics (INACL) which has useful to give phrase labels in sentences. This Application has advantage in User Interface (UI) system, where word's structure in a sentence can be built into tree structure in real time, so users see and do sentence's structure easily. Since every application has advantages and disadvantages, TIKSentence TreeMaker has a disadvantage where this application cannot assist users in giving phrase labels and users can give any labels freely whether it is fit or not to the word's structure. Author try to correct this disadvantage by creating a system that can detect phrase labels and give a recommended phrase label that fir for the word's structure. This system is built to detect phrase labels in syntactic manner with Context Free Grammar (CFG) where it is useful to change application's tree structure phrase into another form that can be readed by computer easily. System check every structure phrase that tested and change its phrase labels if the phrase labels are detected to be incorrect into a phrase label recommended by the system without change its phrase structure. The accuracy result of the built system is around 95% while the initial data test is around 87% which means our system succeds changing some incorrect phrase labels into correct phrase labels.