The purpose: determination of classification model of 7-9 years old boys' motor fitness. The methods of the research: we used the following methods of research: analysis of scientific literature data, pedagogic testing, methods of mathematical statistics. As method of simulation we used discriminant analysis. In our researches 7 boys of 7 yrs. age (n=22), 8 years. age (n=27), 9 yrs. age (n=29) participated. Results: we the calculated canonic coefficients of discriminant function (not standardized). They play role of multipliers of the set values of variables, which are components of discriminant function. On the base of them it is possible to classify pupils by level of motor fitness according to their age that is of practical importance. Analysis of discriminant functions' structural coefficients permitted to specify indicators, by which it is possible to classify boys of 7, 8 and 9 years old (function 1). Besides it permits to specify indicators, by which we could separate 8 years old boys from 9 years age (function 2). Discriminant analysis permitted to answer the question: how confidently one can divide one class from the other by the set of offered variables; which of these variables influence the most substantially on specifying of forms; to which form the object belongs on the base of discrminant variables. Conclusions: Statistically confident differences of mean group results of testing were observed in the following tests: walking of segments of hexagon (steps, p<0.033); 30 meters' run (s, p<0.001); long jump from the spot (cm, p<0.002); 300 meters' run (min, p<0.001); chin ups on rope in mixed hanging (quantity of times, p<0.038); shuttle run 4х9 meters (s, p<0.001); rising in sitting position per 1 minute (quantity of times, p<0.009); body height (cm, p<0.001); distance from acromion to acromion (cm, p<0.001); index assessment of mobility in shoulder joints (p<0.005); side circles with stick (points, p<0,.009); frequency of arms' movements (quantity of times, p<0.048); walking along straight line after 5 rotations (cm, p<0.002); catching of falling stick of Dietrich (cm, p<0.036). For finalizing pedagogic control of 7 yrs. age boys' motor fitness first discriminant function can be use, with accent on the most informative variables. If results of 7 yrs. Boys are classified as results similar to 8 yrs. boys it would be possible to speak about effectiveness of physical education. For summarizing pedagogic control of 8 yrs. age boys' physical fitness results of 9 years old boys are benchmarks, providing they are accented on the most informative indicators of discriminant function.