Through analyzing the collected samples which are from three Chinese-English learners in ICLE project(Portsmouth Chinese-English learner corpus),this analysis project aims to describe the grammatical status of some non-native features in Chinese students’ writing and answer the following two questions:①Do these features seem to be performance mistakes(i.e.are they random) or is there evidence that they reflect an interlanguage grammar(ILG)(i.e.where they appear to be systematic errors)?②In the case of systematic errors,do they seem to be errors transferred from the L1(first language of the students) or do they seem to be developmental errors(shared by learners from other L1 backgrounds)? Through analyzing the collected samples which are from three Chinese-English learners in ICLE project(Portsmouth Chinese-English learner corpus),this analysis project aims to describe the grammatical status of some non-native features in Chinese students’ writing and answer the following two Questions:1Do these features seem to be performance mistakes(ieare they random) or is there evidence that they reflect an interlanguage grammar(ILG)(iewhere they appear to be systematic errors)?2In the case of systematic errors,do they seem To be errors transferred from the L1(first language of the students) or do they seem to be developmental errors(shared by learners from other L1 backgrounds)?