[[abstract]]This study investigated effects of teaching chemical formula with science text jointed ‘’ valence electron’’ concept and how students feel about the designed text. The study designs are quasi-experimental design and survey research with questionnaire. Three hundred and ninth 9years students from eleven classes two school participated in this study. Two school are in Taipei and Taoyuan. Eleven classes were assigned into two groups. The controlled group was taught with science text used now. The experimental group was taught with science text included valence electron. All subjects exam pre- and post-test. At the same time, 10 years students wrote the questionnaire. The reliability（α）of pilot and post-test were.90 and .89.The results are found（1）There was significant difference(p<.05) in「post-test grade」、「chemical formula Chinese translate English」、「chemical formula English translate Chinese」and「chemical reaction formula」and experimental group are better than controlled group.（2）There was no significant difference in「chemical formula’s meaning」、「matter」and「mass equal law」concepts.（3）Based on subjects’ chemistry scores of the semester in Taoyuan, experimental group and controlled group have no significant difference, no matter belonging high, middle and low scores groups. But high and low scores group have significant difference(p<.05) in improvement grades. Experimental group are better than controlled group. （4）Based on subjects’ post-test , high scores group has significant difference(p<.05). Experimental group are better than controlled group. But. middle and low scores groups have no significant difference.Improvement grades are the same. Survey investigation’s results shows（1）subjects felt science text with valence electron are the same with this study designed principles.（2）77﹪subjects felt science text with valence electron can more clearly explain chemical formula.（3）81﹪subjects felt science text with valence electron can more show the relations of science theories.（4）75﹪subjects like science text with valence electron. Summary, subjects can receive this study designed science text with valence electron.
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