Cataract is the leading cause of low vision and blindness in the world. Most cataracts are related to aging because the life expectancy of population becomes increased in the world.However, the research ofthe types of cataracts has been studied in Mongolia, it is not investigating correlation between in the types of cataracts and the result of biochemistry, therefore it was the background of our research. To determine the correlation among the mongolians aged 50 and older for compare some biochemical results of blood and types of the senile cataract.Total 80 patients with cataract and aged over 50 were case-based selected for the study from November 2010 to November 2011 at the Department of Ophthalmology ofFirstCentral Hospital of Mongolia. There had been collected according to the questionnaire of risks, and records of biochemical examination. Eye examinations had been performed lenses evaluated with the biomicroscope and determined the lens opacities rightly to Lens Opacities Classification Systems-III (LOCS III, the international standard classification). And we used SPSS 16.0, The mean age of all participants was 70 (±9.36) years and 56.2% were female, 43.8% males. The study shows that cataract types: nuclear was 48.8%, cortical 10%, posterior subcapsular (PSC) 41.2%. The hypertriglyceridemia (≥2.26 mmol/L) was associated with PSC (p = 0.025). There was no statistically significant association between blood glucose and cholesterol level and senile cataract. Nuclear cataract was the most common type of senile cataracts in Mongolia. It was same that hypertriglyceridemia was related to PSC developing in comparison of some studies, which conducted in some nations.