Abstract: The paper has summarized the auther achievments in isotope study of caol and its coalification products in recent ten years. δ¹³C values of all macerals coal range from -22.5‰ to -25.5‰, average value is -24.4‰. Affects of coalification and geologic age can be ignored. However, the more exinite,the lighter δ¹³C value of coal. The products of coal thermal simulated experiments rule of δ¹³C value is that methane in gaseous hydrocarbon has lightest isotope composition when liquid hydrocarbon produces most, δ¹³C of liquid hydrocarbon is similar to coal, organic compositions δ¹³C value of alkanes gets heavier with temperature increases. Sulphur and hydrogen isotope composition of coal are evidently effected by environment.