As the demand of translating large volume of material between Portuguese and Chinese is increasing rapidly nowadays, especially in the city of Macau, the translation work becomes impractical without the support of effective tools. In order to fulfill this gap and build up a translation workbench environment for translators, a Machine Aided Translation System between these languages, PCTAssist, is introduced. It is a hybrid system that applies not only Translation Memory technology but also Machine Translation methodologies, including the annotation schema of Translation Corresponding Tree (TCT) in the representation of bilingual examples, and the language formalism Constraint Synchronous Grammar (CSG) in analyzing the syntactic structure between the languages to accomplish the translation task.