Students have variety attitudes in writing class. Those are the students who have positive or negative attitudes. Attitudes is an individual differences among students which is greatly agreed to have an influence on learning in general including their writing skill in writing class. This research discussed the influence of students’ attitudes in writing class on their writing skill. The objective of this research is to explain the influence of students’ attitudes in writing class on their writing skill. The population of this research is the tenth grade students of SMK N 4 Kendal . The total population of this research is 493 students. The writer took 15% from the population as a sample from the research with the total of sample is 71 students. The sample consist of two classes, those are 10 RPL (Rekayasa Perangkat Lunak) 1 and 10 RPL (Rekayasa Perangkat Lunak) 2. This research is quantitative research. The data were collected through test and questionnaire and were analyzed using Regression. In this research, it was found that there was a significant influence of students’ attitudes in writing class on their writing skill. It could be seen from Regression result was Freg>Ftable, that was 225,335>3,98. Therefore, the hypothesis was accepted. It means that there was influence of students’ attitudes in writing class on their writing skill.