This study presents the analysis of writing programs which can increase the students’ writing skill by concerning students’ errors. The method used qualitative and quantitative analyses. The participants involved in this study were 30 students of the third level majoring in analytical chemistry department in Politeknik AKA Bogor, academic year 2021/2022. The Researcher wanted to know the area of errors in each writing program. The result shows that the average of grade students got in the program of teaching reading and vocabulary was 68.75% with 31.25% error in the area of identifying the words: analysis, analyze, analytical, analyst, prepare, preparation, determine, determination, require, and statistically. In the program of teaching grammar and structure, the students’ score average was 70% which was bigger than the first program. Meanwhile the average of error was 30% in the area of using past tense, present tense, present perfect tense, modal auxiliary, passive voice, relative clause, past and present participle. In the next program, analyzing sentences from chemistry textbook, the students had difficulty in identifying main and relative clauses, and analyzing present and past participles in a sentence. The students obtained 71.25% for the average of grade and 28.75% error. In writing from simple to complex sentences, the students got score 77.5% and 22.5% error in the area of making sentences consisting of main and relative clauses and applying present and past participles as verb in a sentence. Finally, after having 4 programs stated above, in the program of writing practice report, the students got average of grade 80% meaning excellent, and 20% error in the area of interpreting data in writing and developing main idea. This research finds that the writing programs: teaching reading vocabulary, teaching grammar and structure, analyzing sentences from chemistry textbook, writing from simple to complex sentences, and writing practical report are the writing programs that can increase the students’ writing skill. To make the decision which area of writing programs needs to have more attention, it can be determined by analyzing the students’ errors.