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The purpose of this study was to evaluate respiratory functions in relation to the gross motor functions(total value of GMFM), the difference of chest girth, and the changing position in spastic children. The respiratory functions(FVC, FEV1, FEV1%, and PEF) were measured in the supine, the 45^{circ}semi-sitting, and the 45^{circ}sitting in 9 subjects. In the supine position, the mean difference of chest girth was 1.56{pm}0.80cm, the total value of GMFM was 45.41{pm}17.79%. In the supine position, there was significant positive relationship in FVC-FEV1, FVC-PEF, and FEV1-PEF, but there was no significant relationship in GMFM and all respiratory functions. In the 45^{circ}semi-sitting, there was significant positive relationship in GMFM-FVC, FVC-FEV1, FVC-PEF, FEV1-PEF, and FEV1%-PEF. In the 90^{circ}sitting, there was significant positive relationship in GMFM-FEV1, GMFM-FEV1%, FVC-FEV1, FVC-PEF, and FEV1-PEF. In results of measured respiratory functions according to the postures, the supine position had highest value in all respiratory functions, but there were no significant (p<0.05).
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