A web-based database is developed to provide psycholinguists with a large-scale phonological representation system for all Mandarin Chinese monosyllables. The construction of the system was based on the slot-based phonological pattern generator (PatPho), with an adequate consideration of the language-specific features of the Chinese phonology. Users can retrieve the relevant phonological representations through an interactive query system on the web. The query outcomes can be saved in a number of formats, such as Excel spreadsheets, for further analyses. This representation system can be used for a variety of purposes, in particular, connectionist language modeling, and more generally, the study of Chinese phonology.