The Test for English Majors Band-4(TEM4) is annually taken for the second year students in China and it is based on the requirement of English teaching syllabus for English majors. This paper has collected some of students' compositions of TEM-4, and according to the score evaluation of the syllabus as well as TEM-4, the paper aims to analyze students' errors and find out their reasons behind in order to improve students' writing capacity in TEM-4.