Article is devoted to the review of literature data, and also the analysis of results of own researches concerning genetics, molecular genetics and immunological violations at various forms of the autoimmune diabetes (DM) including classical T1DM, LADA type and an autoimmune polyglandular syndrome of 1 type (APS1). In case of T1DM more than 80% of patients are carriers of one or two strongest predisposing haplotypes: DRB1*04-DQA1*0301-DQB1*0302 and DRB1*03-DQA1*0501-DQB1*0201 designated as DQ2 and DQ8. HLA genes can model a clinical features of disease. In Russian population, the children with diabetes manifestation up to 5-year age has significantly often high risk genotypes (DQ2/ DQ8) and significantly less the low risk genotypes in comparison with children, who had manifestation of T1DMin 10 years and later. The long-term 16-yearsfamily studies showed the maximum frequency of TJDMin high risk group, constantly accruing in process of increase in term of supervision, and in groups of an average and low risk lower and invariable. The highest risk of T1DM manifestation, reaching 90% at 10 years of supervision is defined by existence of HLA high risk genotypes and many antibodies, revealedfrom early age. LADA - the hybridform of autoimmune DM having signs of T1DM and T2DM in the basis. The development of autoimmune process against β-cells can be caused by only gene mutation (APS1). The part of T1DM cases which doesn't have the contributing HLA genes and autoimmune markers in process of studying of the importance of various genes and their biological value can be attributed to new, yet unknown forms of DM.