Scientific style is divided into so-called sub-styles, whose ground of dissociation – reader and its goals, i.e. one of the non linguistic factors, - is component of communication act. All features of sub-style of popularizing science are determined by the ratio between author and reader. Author is qualified specialist and the reader is not specified. The most important function of sub-style of popularizing science is to present formal information. Expressive and appellate functions are realized in conjunction with message and popularizing function. Popularizing science texts, likewise scientific texts are dissociated on the other base, i.e. under the content of rendering information. This principle recognizes exact science, natural and art texts, which are divided according to physiques, mathematics, astronomy and other sciences. The average length of popularizing science sub-style sentence is x=12,5 words. The difference between average length of sentence of all sciences texts is not big (x=12,3 words in art science, x=13,1 words in natural science and x=12,1 words in exact science). Simple sentences dominate in texts of popularizing science sub-styles and totals 66,6 %. In consequence composite sentences makes only 33,4 %. The distribution of sentence length groups in texts of all sciences is not even, but the same tendency is noted: the center of frequencies consists of short sentences, the second place takes very short sentences. The group of average length sentences... [to full text]