Kiswahili is a language used by many people in daily lives. In 1974, President Kenyatta decreed Kiswahili the language of National assembly and that, Parliamentary debates be carried out both in English and Kiswahili (Mazrui and Mazrui 1993). Kenyatta came up with his ideology of Harambee (togetherness) Harambee spirit saw Kenyans fundraise for Construction of Schools and health centers and raise fees for needy students and medical bills. Today, there are many schools categorized as Harambee schools and Polytechnics, which were building via this means. Harambee has also become a political slogan. Kenyatta came up with a slogan uhuru, kazi na Maendeleo (Freedom, work and development). This study focused on factors influencing poor performance of Kiswahili subject among secondary school students in Tigania west sub-county, Meru County, Kenya. Some of challenges facing the Kiswahili as a language of many are; influence of sheng, mother tongue and teaching and learning resources. The study sought to investigate teacher preparation in teaching Sociolinguistics in Kiswahili (Isimu jamii) the methods used and resources available. The objectives of the study were to determine the performance of secondary school students in Kiswahili, to establish the causes of poor academic performance in Kiswahili subject and measures taken by individual to curb poor academic performance in Kiswahili subject among secondary school. Performance in Kiswahili at Kenya Certificate of Secondary Education examination and normal school examinations in both Public secondary schools and private