In a process of architectural design, the role of the language use is important. In order to make the function of language in design process clear, we construct a comoutational model of linguistic instructions to modify the architectural forms. In the model, the words as linguistic instructions and forms are expressed as vectors in a semantic space. The relation of these vectors is determined by exoeriments of word-association to the graphical presentation of forms. The graphical presentation of each form is determined by design variables. The mapping from the vectors to design variables is estimated by neural network model.