This is a PhD dissertation in French linguistics. The main purpose of this dissertation is to analyse and interpret the error made by Chinese primary or intermediate learners, to propose some remedial measures for those recurring and prototypical errors, and to provide a better teaching methodology in teaching French as a foreign language in China. An error is not only an item to be replaced by a correct form, but a significant revealer which allows us to glimpse the learning process of learners. This thesis is to adopt a cognitive approach. From a theoretical point of view, it concerns the linguistic analysis of errors; from a practical point of view, it concerns feasible remedial measures which comprise a micro-remediation and a macro-remediation. The former studies the language motivation in order to make language learning easier and the latter seeks to promote a cognitive approach in teaching in order to train the metacognitive learner and to transform the learner into the subject of learning.