For the purpose of serving the valuable information far the biology banks of senior high school to be applied from 1990 educational year, the contents of the experiments and observations contained in 8 different kinds of `general science I` and 7 different kinds of `biology` books of senior high school developed by the new fifth curriculum. were analyzed, and the obtained conclusions are as follows: 1. Average frequency scores of the experiments and observations among 8 different kinds of biology books are 11 times in `general science I` and 13 times in `biology`, and there are great differences of those. 2. The requiting domains an their experiments arid observations are emphasized on observations and confirmation for principles and theories, and main contents are physiology. 3. Total 43 different kinds of material organisms are used, and especially vertebrates and vascular plants are repeatedly served, The order of using frequencies of their material organisms are human, frog arid onion. 4. The importance for the evaluation of experiments and observations is increased, but the viewpoints and criteria of objective evaluation are insufficient.